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Home > Voip Gateway > 4G LTE Voice Gateway > YXCALL 4G LTE VoIP Gateway 4 Ports 4 SIM Slots AT Command GoIP for Bulk Voice Call and SMS

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YX 4G LTE VoIP Gateway 4 Ports 4 SIM Slots AT Command GoIP for Bulk Voice Call and SMS

Name: YX 4G LTE VoIP Gateway 4 Ports 4 SIM Slots AT Command GoIP for Bulk Voice Call and SMS
Brand: YX SHOP
Price: 400 USD
Availability: InStock
Rating: 5.0 (23 reviews)

GOIP Gateway is a multi-SIM gateway. It links mobile cellular network to VoIP systems via SIP. It supports voice calls and SMS, It works for call centers, supports VPN connection and common audio codecs to run stable voice communication.

● 4 independent ports, each control 1 SIMs – total 4 SIM slot
● 4 SIM cards work at the same time – Bulk SMS and Voice
● YX Platform software – easy to manage calls, SMS, and billing
● Supports USSD, IMEI Change, HTTP API, SMPP, VOLTE, etc
● Supports call forwarding, call waiting and auto answer
● Remote management via ETMS server

$400.00

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Please select the information you want X

PORTS:

GP 4-4 (SMS and Voice)
4G Model:

EC25 / EG91 (Region Specific Global Coverage)

EC20 (Supports IN, RUS, parts of EU & Asia)
Price Tier:

1 Unit Price (Tip: Qty 1 | Purchase One)

2+ Units Price (Tip: Min Qty 2 | No Shipment below 2)
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Description
Product Details
Frequency band
Package

Brand Name	YX
Number of Channels	4 channels 4 SIM slots
Frequency	GSM, CDMA, WCDMA, LTE (When purchasing 4G equipment,If unsure,please confirm the frequency band and module with the account manager!)
Module	EC25/EG91/EC20 (Please refer to the "Frequency Band" interface for specific information)
Function	SIP Voice / STK / AT Command / TCP/IP / Data / SMS / VoLTE / IMEI / MMS / Email / GPRS / GPS / USSD (Please refer to the "Product Details" interface for specific information)
SIP Specification	SIP/2.0, RFC3261 Session, Timer, RFC4028 STUN, DTMF, RFC2833
SMS Specification	SMPP3.4, HTTP, API, EIMS
Network Protocols	DHCP, PPPoE, Static IP, VPN
Telephony Features	Hot-line call ,Dial plan, Speed dial, Phone book,CDR, LCR, White/Black list
Telephony Signaling	DTMF tone dectection/generation DTMF relay: in-band, RFC 2833 and SIP info Call forward:unconditional, no answer and busy N-way conferencing Caller ID display/generation, Mobile Number Portability
Voice Capability	Voice codecs:G729a/b/e,G723.1,G.711 A/U law, iLBC Echo cancellation Silence suppression & detection（VAD, CNG） Adaptive jitter buffer Volume adjustable IVR customized
Number of Ports	1 WAN 10/100Base-T Ethernet(RJ-45 connector) 1 Console(USB)
LED	1 Power and 4/8/16/32 groups of card online and running status indicator
Power Supply	100-240VAC, 50 - 60 Hz IN, 12VDC 3A/5A/7.5A/8A Out
Operating System	All Windows, Linux, Android
Operating Environment	Operating temperature: 0 - 50ºC Operating humidity: 10 – 90%RH
Warranty	12 Months
Support	With instruction manual and technical support (Also has SMS and voice services, please contact us)
Shipping method	Support DHL, UPS, FEDEX, EMS, 4PX Cainiao standard logistics and dedicated lines (some countries have dedicated lines logistics, Specific consultation with customer service) Tip: (1) Express delivery is faster than dedicated lines, but customers need to handle customs clearance and tax payment, and there will be logistics trajectory updates throughout the process. (2) Dedicated line logistics is slower, but includes customs clearance and tax payment, and is delivered directly to the home. The logistics trajectory updates will only be available after the package arrives at customs clearance and is handed over to the local logistics provider.
Payment method	Support payment methods such as USDT, PayPal, credit card, TT, etc (Pay with USDT and there are no additional transaction fees, so 3% discount on the product price is given) Please consult customer service for USDT address,Other payment methods can be redirected to the checkout page for online payment
Ordering Process	Payment for the product you need to order, we will arrange for stock testing after confirming the accuracy of the delivery information with you. We expect to arrange shipment within 2 days and provide you with package picture and logistics tracking number for tracking. Customer service will send message to remind you of tax payment and logistics delivery. If you need technical support after receiving the goods, please leave a message to our customer service personnel, and we will arrange for a technician to assist
Customer service contact information	Whatsapp: +8615220722893 Emai: yx@yxinternet.com Telegram: @YXwendy Teams: yuexun@yx19999.net

The YX 4 Port 4 SIM VoIP Gateway (GP4-4) is a compact, industrial-grade GoIP gateway that bridges IP networks and cellular networks (GSM/WCDMA/4G LTE) for simultaneous bulk voice calls and bulk SMS services. Built with advanced embedded technology, it supports standard SIP 2.0 protocol, multiple voice codecs, intelligent SIM management, and full-featured web & API control.

Designed for small-to-medium call centers, SMS marketers, virtual operators, and enterprise communication, this 4-port 4-SIM model delivers stable voice termination, high-success-rate SMS sending, and cost-cutting communication solutions. It fully supports remote management, automated call/SMS rules, and seamless integration with softswitches, CRM systems, and SMS platforms via HTTP API and SMPP 3.4.

YX 4 Port 4Sim VoIP Gateway Product Packaging Diagram

Core Key Features

1. 4-Channel Concurrent Voice & SMS

4 independent ports + 4 dedicated SIM slots (1 SIM per port)
Simultaneous 4-way voice calls / 4-way SMS sending/receiving
Perfect for small-scale bulk voice termination and bulk SMS campaigns

2. Professional Voice Communication (VoIP)

Supports SIP 2.0, compatible with mainstream softswitches/IP PBX
Auto-selects premium voice codecs: G729a/b/e, G723.1, G.711 A/U, iLBC
FAS shield, fake ringback, echo cancellation, adaptive jitter buffer
Call statistics: ASR, ACD, PDD, call duration, failure analysis
Call controls: duration limit, caller ID hiding, call waiting, inter-call testing

3. Bulk SMS & MMS Full-Featured Support

Supports PDU/TXT SMS format, long SMS, flash SMS
SMPP 3.4 & HTTP API for system integration (GET/POST)
SMS forwarding: SMS-to-HTTP, SMS-to-Email, SMS-to-SIP
SMS scheduled sending, interval sending, prefix routing, filter
SMS statistics: success rate, sent/received/failed counts

4. Intelligent SIM Anti-Block Management

PIN/PUK management, IMEI customization, USSD balance query
Avoid SIM restrictions by carriers for bulk voice & SMS operations

5. Easy Web & Remote Management

Built-in web UI (Chrome/Firefox/IE supported), default IP: 192.168.1.10
ETMS remote management: control device anywhere via cloud platform
Configuration backup/restore, firmware upgrade, log monitoring
User role management, admin & guest permission control

6. Network & Security Optimization

VPN (PPTP) support, proxy encryption to bypass IP blocks
Bandwidth Optimization (BO) for unstable networks
Black/white list, dial plan, prefix translation, intelligent routing
DHCP/Static IP/PPPoE multi-network access

7. Industrial Hardware Design

Compact metal case, LED status indicators for each port/SIM
DC 12V 3A power supply, AC 100-240V wide voltage
Working temperature: 0–50°C, long-term stable operation
4×antennas, 1×RJ45 WAN, 1×USB console port

Step-by-Step Installation & Operation Guide

1. Hardware Installation

Install 4 antennas and insert 4 activated SIM cards
Connect Ethernet cable (WAN port) to router/switch
Plug in DC 12V power adapter and power on the device
Check LED indicators: steady light = power on; flashing = network registered

2. Network & Web Login

Set PC IP to 192.168.1.xxx (same subnet as gateway)
Open browser and visit http://192.168.1.10
Default account: root / password: root
Configure WAN: Static/DHCP/PPPoE under Gateway Settings → Network

3. SIP Configuration (Voice Calls)

Go to Guider → Initial Setting → SIP Server Settings
Enter SIP server IP, port, account, password
Set protocol mode: Registration / Point-to-Point
Check SIP status: Ready = registration successful
Adjust codec, DTMF, jitter buffer under System Settings → Voice

4. SMS Configuration (Bulk SMS)

Enable SMS port in SMS Setting → Port Setting
Set SMS interval, format, status report in SMS Settings
Configure SMS forwarding (HTTP/Email/SIP) in SMS Forward
Set SMS daily/monthly limit in SMS Ctrl Setting

5. Intelligent SIM & Automation Rules

Set SIM rotation rules in Gateway Settings → Automation
Configure USSD balance query in Mobile Setting → USSD
Set call/SMS limit rules to avoid SIM blocking
Save config and reboot to take effect

6. HTTP API Usage (Remote Control)

Send SMS (GET):
Send USSD:
Receive SMS:
......

Ideal Application Scenarios

Bulk Voice Call Termination

For VoIP operators, call centers, and virtual carriers to route IP calls to mobile networks, greatly reducing call costs.

Bulk SMS Marketing & Broadcasting

Send promotional SMS, event alerts, and advertising messages to massive audiences efficiently.

OTP & Security Verification SMS

Stable delivery of login verification, payment authentication, and account protection SMS for apps/websites.

Enterprise Internal & Customer Notification

Order status, logistics alerts, bill reminders, meeting notifications, and after-sales follow-up.

Cross-Border Communication & Roaming

For global business, cross-region voice & SMS services without roaming fees.

IoT & Security Alarm System

Remote device status alerts, fault notifications, and emergency alarm SMS for security systems.

Retail & Hotel Service SMS

Booking confirmations, reservation reminders, membership alerts, and customer care messages.

FAQ (Frequently Asked Questions)

Q1: Is this device a GoIP gateway?

A: Yes, it is the standard YX 4-4 GoIP gateway, supporting SIP-based VoIP voice termination and bulk SMS functions.

Q2: Can it make 4 calls and send 4 SMS at the same time?

A: Yes, 4 independent ports support 4 concurrent voice calls and 4 concurrent SMS sessions.

Q3: Does it support 4G LTE modules?

A: Yes, compatible with Quectel 2G/4G modules (EC25, EG25, M26, etc.), customizable for global bands.

Q4: How to avoid SIM cards being blocked?

A: Use built-in SIM rotation rules (call duration, SMS count, failed calls) and interval sending to comply with carrier policies.

Q5: Can I integrate it with my SMS platform?

A: Yes, supports HTTP API and SMPP 3.4 for seamless connection to CRM, SMS platforms, and softswitches.

Q6: What is the default login IP and account?

A: Default IP: 192.168.1.10; Username: root; Password: root.

Q7: Does it support remote management?

A: Yes, supports ETMS cloud remote management and web access via public IP.

Why Choose YX 4 Port 4 SIM VoIP Gateway?

1. All-in-One Voice + SMS Solution

The 4-port device supporting bulk voice calls and bulk SMS in one machine, saving hardware costs.

2. Carrier-Grade Stabilit

Industrial hardware + optimized firmware, high ASR/ACD for calls, high delivery rate for SMS.

3. Full Anti-Block Protection

Intelligent SIM rotation, call/SMS limits, and IMEI management effectively avoid carrier restrictions.

4. Easy Integration & Control

Web UI + HTTP API + SMPP + ETMS remote, suitable for self-operated and platform access.

5. Compact & Cost-Effective

Small desktop size, low power consumption, perfect for small business & entry-level users.

6. Professional Technical Support

Lifetime firmware updates, detailed user manual, and 24/7 technical support.

Upgrade your business communication with the YX 4 Port 4 SIM VoIP Gateway (GoIP Gateway) — the best entry-level solution for bulk voice call termination and bulk SMS marketing!

Free shipping & one-year warranty
Full driver, manual, and API document package
Professional technical support for setup & integration
4G modules for global regions
Contact us now and start your cost-effective communication business!

↓ Platform admin panel page display
voip gateway panel Port Status

↓ YX Gateway main page to set Gateway display, For other uses, please refer to the instruction manual

Need Assistance? Contact customer service (9:00 AM - 6:00 PM GMT+8) for product images or queries!
Need high-volume communication? This gateway is your all-in-one solution.
Whatsapp: +8615220722893
Emai: yx@yxinternet.com
Telegram: @YXwendy
Teams: yuexun@yx19999.net

↓ VoIP and SMS gateway connection demonstration

About Us

YX International is a professional supplier specializing in consumer electronics, smart devices, and lifestyle products. With years of experience in global trade and a strong supply chain network, we provide businesses and end-users with reliable products at factory-direct prices.

Our mission is to bridge quality manufacturing with global buyers, making cross-border sourcing easier, faster, and more transparent. From product selection to quality control, and from fast delivery to after-sales support, YX International ensures every order meets high expectations.

Why Choose Us

Extensive Product Range：From smart electronics to innovative gadgets, we cover a wide range of categories to meet various market demands.
Direct-from-Manufacturer Pricing：We work directly with reliable factories, ensuring competitive wholesale prices with no hidden costs.
Strict Quality Control：Every product goes through multi-level quality checks, from factory audits to pre-shipment inspections, guaranteeing what you receive matches your expectations.
Efficient Logistics Network：With global shipping partnerships, we offer fast and trackable delivery to over 100 countries, keeping your orders on time.
Dedicated Customer Service：Our professional team is ready to support you before, during, and after your purchase, ensuring your sourcing experience is smooth and hassle-free.

FAQ

How do I know if the YXCALL gateway supports my country's network operators?

Our voip gateway works globally as long as the device’s frequency bands match the local networks. When ordering, you can specify your country so we ship the model with the correct EC25/EC20 module for your operator. This ensures compatibility with GSM, CDMA, WCDMA, and LTE networks.

Can I integrate the YXCALL 4G LTE gateway with my existing enterprise system?

Yes, our sms gateway API supports multiple protocols like SMPP 3.4, HTTP API, and TCP/IP for seamless integration. The gateway also supports AT command sets, allowing you to automate bulk voice calls and SMS messaging directly within your enterprise environment.

Does your 4-port gateway support multiple SIM cards for different operators?

Yes, the YXCALL device includes four SIM slots, enabling you to use multiple operators simultaneously for enhanced coverage and load balancing. This feature is ideal for bulk calling campaigns or regional redundancy using different mobile network providers.

What security features are included with the YXCALL VOIP GSM gateway?

Our voip gsm gateway includes DHCP/PPPoE, VPN support, NAT traversal, and encryption options to secure your communication channels. The device is designed to maintain reliability and confidentiality in voice and SMS transmissions across IP and cellular networks.

1、Overview
VoIP GSM gateway (GoIP gateway) is a device that can reduce the cost of calling mobile networks from fixed telephone lines. It can route directly between IP, digital, analog, and mobile networks. GoIP gateways are increasingly being used by telephone operators to connect IP calls to mobile networks. In areas where fixed line services are unavailable or much more expensive than mobile costs, GoIP gateways are an irreplaceable alternative.

The following figure shows a basic topology of GP Gateway usage.

2、Product Brief
YX series GP Gateway is a multi-functional and high performance product, which is designed with advanced embedded technology. YX series is able to process traditional voice call service and internet data service. perfectly support G729a/b/e、G723.1、G.711 a/u law and iLBC codecs at the same time.
YX series GP Gateway please check the following table about the difference:

Model Number	Channel	Sim capacity in each channel	Total sim capacity	Frequency(optional)
YX GOIP 4-4	4	1	4	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 8-8	8	1	8	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 8-32	8	4	32	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 16-16	16	1	16	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 16-64	16	4	64	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 16-128	16	8	128	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 16-256	16	16	256	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 16-512	16	32	512	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 32-32	32	1	32	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 32-64	32	2(1 Big+1 Small)	64	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 32-128	32	4	128	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 32-256	32	8	256	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 32-512	32	16	512	GSM / CDMA / WCDMA / 4G(LTE)
YX GOIP 64-64	64	1	64	Currently unavailable, development in progress
YX GOIP 64-256	64	4	256
YX GOIP 64-512	64	8	512

3、Appearance

● 4/8/16/32 Antennas
● 1 USB Serial Port (Baudrate 115200)
● 1 Network Interface (RJ45)
● 1 Power Interface (DC 12V 3A/5A/7.5A/8A)
● 1 Power light
● 1 Reset Button
● 4/8/16/32/64/128/256/512 SIM card slots
● 4/8/16/32/64/128/256/512 LED lights

4、Special Features

● Support G729a/b/e,G723.1,G.711 A/U law, iLBC auto-selecting

● BO(Bandwidth Optimization)

● Proxy Encryption Solution for IP Block

● Support SIM Bank

● VPN(pptp)

● SIM Card Rotating

◆ SIM card check and switch rules:

◇ Accumulated Call Duration

◇ Accumulated Connected Calls

◇ Accumulated Calls

◇ Consecutive Failed Calls

◇ Consecutive No-Alert Calls

◇ Consecutive No-Answer Calls

◇ Consecutive No Carrier Calls

◇ Consecutive Short-Duration Calls

◇ Consecutive Fast-Alerting Calls Checking

◇ Consecutive Fast-Answer Calls CheckingGSM/CDMA/WCDMA/4G(LTE) VoIP/SMS Gateway

◇ Consecutive GSM Release Cause Checking

◇ Accumulated SMS Count Checking

◇ Accumulated Failed SMS Count Checking

◇ Consecutive Failed SMS Count Checking

● Station intelligent switching(By switching rules)

● ERMS(Easement Remote Management System)

● Port Inter-Calling

● Fake Ring back

● FAS shield

● Call waiting

● Call Duration Limitation for SIM Card/Single

● Dial Plan/Prefix Inward Translation/Intelligent Routing

● Web Browser: Firefox/Chrome /IE/Opera

5、Specification

Number of Channels	4 channels 4 SIM slots 8 channels 8/32 SIM slots 16 channels 16/64/128/256/512 SIM slots 32 channels 32/128/256/512 SIM slots
Frequency	GSM, CDMA, WCDMA, LTE(When purchasing 3G or 4G equipment, please confirm the frequency band and module with the account manager!)
SIP Specification	IP/2.0 RFC3261 Session Timer RFC4028 STUNS
SMS Specification	SMPP3.4
Network Protocols	DHCP/PPPoE/VPN(pptp) NTP Telnet/HTTP/FTP/TFTP Encryption:Security,VOS2000,RC4,XOP.Base64
Telephony Features	Hot-line Send SMS ,Dial plan, Speed dial, Phone book, CDR, LCR, White/Black list
Telephony Signaling	DTMF tone dectection/generation DTMF relay: in-band, RFC 2833 and SIP info Call forward: unconditional, no answer and busy N-way conferencing Caller ID display/generation, Mobile Number Portability
Voice Capability	Voice codecs:G729a/b/e,G723.1,G.711 A/U law, iLBC Echo cancellation Silence suppression & detection（VAD, CNG） Adaptive jitter buffer Volume adjustable IVR customized
Number of Ports	1 WAN 10/100Base-T Ethernet(RJ-45 connector) 1 Console(USB)
LED	1 Power and 4/8/16/32/64groups of card online and running status indicator
Power Supply	100-240VAC, 50 - 60 Hz IN, 12VDC 3A/5A/7.5A/8A Out
Operating Environment	Operating temperature: 0 - 50ºC Operating humidity: 10 – 90%RH
Warranty	12 Months

6、Mobile Features

● SMS Send, Receive and Forward(GSM/SIP/HTTP)

● SMS Inbox

● AT Command , USSD

● SMS Format: PDU/TXT

● PIN Code Management

● CDMA Delay Answer

● GSM Polarity Reversal

● Carrier Selection

● Caller ID Hidden(need SIM Card support)

7、Maintenance and Management

● Multi-language Interface

● USB Serial COM

● Configuration Backup and Restore

● Support HTTP/TFTP Upgrade

● Call statistics: ASR,ACD,PDD

● WEB Remote Management System

● SMPP support

● HTTP Command

▼The following pictures are demo of the platform's interface setup and operation

8、FAQ

Q1. Does GOIP or MOIP support custom calling number/sender ID when making phone calls or sending text messages?

A：The device uses a SIM card, which naturally displays the SIM card number when making calls or sending text messages. This is determined by the SIM card itself and the SIM card operator, and generally does not support custom calling numbers/sender IDs. In VOIP and network SMS services, only the operator's routing (CLI and direct connection) may be supported!

Q2. Does GOIP or MOIP support detecting surrounding mobile phone information, listening to surrounding calls, tracking/tracing mobile phones/calls/SMS, IMSI Catcher and other detection functions?

A：This type of feature has no connection with our product and is not supported!

Q3. Does GOIP or MOIP support wifi or multi wifi functions to provide data internet access and other functions?

A：The functions related to wifi/data internet are not related to any of our devices and are not supported!

Q4. Does GOIP, MOIP, or SMS modem support functions such as MMS, picture SMS, voice SMS, video calls, etc?

A：SMS modems can support MMS (customers need to have their own software support, we do not provide MMS software), and the latest version of YX GOIP/MOIP can also support sending MMS. Other products do not support it

Q5.Does GOIP support the function of hiding the caller when making phone calls?

A：The device has a setting function to hide the caller, but it requires the SIM operator to support this function at the same time.

Q6. Does GOIP and modem have API?

A：The GOIP/MOIP of YX series has HTTP APIs for sending/receiving SMS and USSD, and supports customer developed software to call through HTTP; DBL's GOIP does not have an API that can be directly used, but if the client has their own server, after installing a GOIP SMS sending server software, they can use the SMS HTTP API; The modem does not have an API.

Q7. What devices can make voice group calls?

A：SMS modems do not support direct audio access and cannot play voice after calling out. GOIP can support it, but GOIP cannot automatically call out and requires the call center to provide functions for calling out and playing voice

Q8. Is there a device that supports receiving and forwarding SMS messages?

A：SMS modems can receive text messages, but they do not support forwarding. Additionally, the software we provide does not support checking which port received the messages

YX GOIP/MOIP can receive information and forward it to email/HTTP address/SIP server/other phone numbers or HTTP API directly from the device (Commonly used methods include email or HTTP API retrieval)

Q9. Can the device support international roaming? What should be noted?

A：1. The SIM card needs to be able to roam to the target country. 2. It is necessary to understand the frequency band of the target country, and the device needs to be matched with the frequency band of the target country (if there are too many frequency bands in the target country, it can also be determined which operator in the target country can provide roaming signals for the SIM card, and the device needs to match the frequency band of the operator that provides roaming signals)

Q10. What is the SMS sending speed for MOIP/GOIP?

A：GOIP/MOIP(2G/3G/4G): 720 per port per hour (the above standard testing environment may vary depending on the device environment)

Q11. Does SIMBank support connecting to devices other than GOIP and MOIP, do they have APIs, and can different brands of SIMBANK and GOIP be used?

A：SIMBank does not support connecting to devices other than GOIP and MOIP, there is no API, and different brands of SIMBANK and GOIP cannot be used

Q12. How can SIMBANK connect to GOIP/MOIP and card the device?

A：SIMBANK generally requires the use of the software SIM Server installed on the server to manage, connect, and allocate cards, in order to achieve remote card access. If there is no server, one needs to be rented, and the system requires CentOS 5. X or 6. X

Q13. What are the ways to send/receive SMS for YX series GOIP/MOIP and DBL?
A: (1) Login to the device page to send/receive directly;
(2) Directly connect to the SMS platform (only support EIMS/IMFS) to send/receive;
(3) use HTTP API to send/receive directly (customers may need their own software/platform support);
(4) if the customer has a public IP, the customer can set the public IP to GOIP, and then send SMS after docking with SMPP SMS platform;
DBL's no API can only use the page to send or use the server supporting SMS sending software to send.

Q14. Can GOIP or MOIP use the data traffic inside the SIM card to give users access to the Internet?
A: No, we don't have this kind of equipment.

Q15. Difference between YX GOIP and DBL GOIP in terms of sending and receiving SMS.
A: DBL can only send and receive SMS in the device (SIM reason, the maximum number of messages received is 50), or the customer has its own server to install information management software (can send and receive, unlimited number of SMS).
YX can send and receive SMS in the device (SIM reasons to receive information up to 50) or you can use our free ETMS management software (can be received, but sent to need to use another EIMS2, unlimited number of SMS), if the customer has the ability, the device also has a HTTP API can be accessed to their own development of the program (support for sending and receiving)

Q16. Can GOIP/modem be used in XX countries (or a certain operator)?
A: The product has nothing to do with the use in which country or which operator, as long as the frequency band of the device can match the local (or the operator to be used), it can be used!

Because the 4G frequency band is different in different countries or regions, when placing an order, please indicate the country in which the product is used. If there is no indication, we will select the corresponding frequency band model based on the country where the shipping address is located.

Product Feature
Name	4G LTE Wireless Modem
communication interface	USB
Chipset	Quectel EC25 / EG91 / EG25 / EC20
Function	SIP Voice / STK / AT Command / TCP/IP / Data / SMS / IMEI / MMS / Email / GPRS / GPS / USSD
Frequency	EC25-EUX / EG91-EX :(Asia, Europe,Africa, the Middle East,Southeast Asia, Vietnam, Myanmar, Laos, Cambodia, Malaysia, Singapore, Russia) LTE FDD: B1,B3,B5,B7,B8,B20,B28 LTE TDD: B38,B40,B41 WCDMA: B1,B5,B8 (900/2100MHz) GSM: B3,B8 (900/1800MHz) EC25-AFX / EG91-NAX :(United States and Canada) LTE FDD: B2/B4/B5/B12/B13/B14/B66/B71 WCDMA:B2/B4/B5 (1900,1700,850MHz) EC25-AUX / EG91-AUX :(Australia, New Zealand and Latin America, Mexico, Peru, Colombia, Brazil, Chile, Argentina, Dominican Federation, Venezuela, Honduras, Guatemala, Nicaragua, Costa Rica, Panama, Cuba, Guyana, Bolivia, Paraguay, Uruguay, etc) LTE FDD: B1/B2/B3/B4/B5/B7/B8/B28/B66 LTE TDD: B40 WCDMA: B1/B2/B4/B5/B8 (850,900,1700,1900,2100MHz) GSM:B2/B3/B5/B8 (850,900,1800,1900MHz) EC25-J :(Japan) LTE FDD: B1/B3/B8/B18/B19/B26 LTE TDD: B41 WCDMA: B1/B6/B8/B19 EG25-G :(Global Full Frequency） LTE-FDD: B1/B2/B3/B4/B5/B7/B8/B12/B13/B18/B19/B20/B25/B26/B28 LTE-TDD: B38/B39/B40/B41 WCDMA: B1/B2/B4/B5/B6/B8/B19 GSM: B2/B3/B5/B8 EC20 :(China, India) LTE FDD: B1/B3/B5/B8 LTE TDD: B34/B38/B39/B40/B41 WCDMA: B1/B5/B8 (900,2100MHz) TD-SCDMA: B34,B39 (900,2100MHz) EVDO CDMA: BC0 (800MHz) GSM: B3,B8: (900,1800MHz)
Operating System	Win all, Linux, android
Working voltage	AC 100-240V / DC 12V
Warranty	One Year