YX 4G LTE 1-2-3-4 Ports Dongle Bulk send SMS Modem High speed wireless Internet

Detailed Description:
Modular 4G SMS Hub for Flexible Scaling
● 1-4 SIM Scalability: Expand from 1 to 4 SIMs using the 4-port UART HUB, achieving 14,400 SMS/hour* (*3,600 per port) to match your business growth.
● Multi-Network Agility: Supports 4G LTE, GSM, CDMA, and WCDMA networks (700-2700 MHz)—confirm local frequency bands for optimal performance.
● Plug-and-Play USB: Directly connect to PCs/laptops—Windows, Linux, or Android systems.

Enterprise-Grade Features for High Efficiency
● Dual SIM Formats: Default 2FF Mini SIM + optional 1FF IC card converter for legacy compatibility.
● Advanced Protocols: STK, AT Commands, TCP/IP, SMS/MMS, GPRS, GPS, and HTTP/FTP/SMTP/MQTT integration.
● GPRS Class 12 Optimization: High-speed data transfer with CS-1 to CS-4 encoding and PPP/PAP security.

Future-Proof Design & Reliability
● Free SMS Caster Pro: Automate campaigns, monitor analytics, and manage multi-device clusters seamlessly.
● Military-Grade Security: Encrypted data via RC4 and Base64 protocols for secure operations.
● 12-Month Warranty: Backed by YXCALL’s global support network and detailed technical manuals.

Key Benefits:
→ Cost Saver: Replace multiple devices with one compact dongle.
→ Global 4G: Supports 700-2700MHz bands in 100+ countries.
→ Developer-Friendly: AT commands for APIs, Python, or IoT integration.

Perfect For:
● High-volume SMS marketing
● Remote teams needing reliable internet
● OTP verification & appointment reminders
● Startups & SMEs scaling operations

Tech Specs:
Network: 4G LTE
Ports: 1-4 SIM slots via USB
Speed: 3600 SMS/hour per port
OS: Windows, Linux, Android
Warranty: 12 months

Launch in 3 Steps:
1. Insert SIM.
2. Plug into USB.
3. Start Sending and Receiving!
Launch Faster, Spend Less, Do More!

Need 4X SMS + Internet in one tool?
Includes SMS Caster & EC25/EC200A Modules.
Need Customization? Contact us for bulk orders, SIM converters, or frequency band checks!

Whatsapp: +8615220722893
Emai: yx@yxinternet.com
Telegram: @YXwendy
Teams: yuexun@yx19999.net

For detailed product operation, please refer to the relevant manual or contact customer service for assistance

About Us

 YxInternet 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, YxInternet 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

1.Who are we?

YxInternet is a trusted supplier offering consumer electronics, smart devices, connecting global buyers directly with high-quality factories.

2.How can we guarantee quality?

Factory audits to verify production capabilities

Product sampling and testing

Pre-shipment quality checks to confirm product specifications

3.What can you buy from us?

We offer a wide range of products, including:

SMS Modem

SMS Dongle

Voip gateway

SMS gateway
eSIM Gateway
IP Phone
Modules/Accessories

Customized products for bulk orders

4.Why should you buy from us instead of other suppliers?

Direct factory pricing with no middleman markup

Comprehensive quality control from production to delivery

Flexible order solutions for both retail and wholesale

Fast global shipping and reliable logistics

Dedicated after-sales support to resolve any issues

5.What services can we provide?

Product sourcing and customization

OEM and private label support

Product quality inspections

Global shipping coordination

After-sales support and warranty services

1、Overview
SMS dongle is a device used for bulk send and receive of SMS on mobile networks.
Built-in wireless 4g module can insert into 1-8 SIM card.Can be used directly into the computer USB port for laptops and desktops,also be used in conjunction with UART HUB
▼The following picture shows the USB Dongle 4G EC25 module

Note: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.

2、Product Brief

▼4G LTE Dongle supports wireless internet access

▼SMS Caster interface operation demonstration

3、Appearance

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4、Specification

2G: M26/ M35;
3G:UC20/ UC200T;
4G: EC25/ EC20/ EC200A

GSM: 850/900/1800/1900MHz
3G WCDMA: 850/900/1700/1900/2100MHz
4G LTE: 700-2600MHz

Options：Paired with UART, can be use 1/2/3/4/5/6/7/8/9 slots and more

Speed: 2G: 800-1000 sms, 3G:2500-2800 sms, 4G:2500-3600 sms per port per hour Send and receive SMS,MMS
UART ransmitting speed: 9600/19200/115200

SIM interface:Default is 2FF Mini SIM (15mm*25mm), Optional conversion to 1FF (big size IC card)
Working voltage: DC 5V
TTL voltage: DC 3.3V

5、Function

The main function of the product is High-Speed internet access and Internet of Things apply, SMS or voice notification reminders.

Directly connect to your computer, the main function depends on the software, such as SMS Caster which we provide for free (you can download it from our website and check the specific function):
   ● Support batch mass SMS, flash message, long SMS, MMS (need to have their own software support);
   ● Support importing contacts and importing messages directly (by importing forms);
   ● Support timed tasks, support auto-reply (need to set keywords);
   ● Support multi-task sending (send by port), support intermittent sending (you can set how many seconds to lock after sending how many);
   ● Export unfinished tasks, etc.


About Change IMEI/Send USSD/Call/Put in PIN/PUK code(AT command)

● Change IMEI

1. open Putty

2. click " Serial"
3. Input the com port in "Serial line" such as COM 1

4. PUT IN "at&f"

5. put in "at+cgsn"//check IMEI

6.at+egmr=1,7,"IMEI number" change imei

for example: AT+EGMR=1,7,"453243242432134"

if you put in imei is wrong ,it will reset or keep old IMEI

7. put in "at+cgsn"//check new IMEI

● Send USSD

1. open Putty

2. click " Serial"

4. PUT IN "at&f"

5. put in "at+cusd=1,"USSD command""

for example:at+cusd=1,"*097#"

● CALL

1. open Putty

2. click " Serial"
3. Input the com port in "Serial line" such as COM 1

4. PUT IN "at&f"

5. put in "ate1"

6. put in "atd number;"

for example:atd 0976006161;

7. put in"ATH" hung off call

Put in PIN/PUK code

1. open Putty

2. click " Serial"
3. Input the com port in "Serial line" such as COM 1

4. PUT IN "at&f"

5. PUT in “at+cpin?” //check PIN status

If display “ready”=> it is ok, don’t need put in PIN code

If display ”SIM PIN” =>need put in PIN code

PUT IN ”at+cpin=PIN code”,
for example: at+cpin=1234

If display ”SIM PUK” =>need put in PUK code

PUT IN “at+cpin=”PUK code”,”NEW PIN code” ” ,
for example: at+cpin=”12345678”,”1234”

About UART HUB

If you need to use it in bulks, need to purchase UART HUB with TTL=3.3V. Our store has HUB with 4/8 channels available for purchase.

TTL UART USB2.0 HUB for Raspberry Pi/ Modem/ COM ports, provides more USB capability to your Pi, what's more, it features USB to UART converter for easy serial communication.

It can work with various versions of the Pi, and the size of the board is designed to perfectly fit the Zero / Zero W / Zero WH.

The product adopts 5V input power supply, compatible with USB power supply, and has an output TTL level of 3.3V. It can be directly connected to various GSM 4G LTE MODEMs, DONGLE, and microcontrollers.

USB HUB HAT Features
● USB Ports, compatible with USB2.0/1.1
● Onboard USB to UART, with enable / disable switch, convenient for Raspberry Pi serial debugging and avoiding conflict

6、FAQ

Q1. COM and port number is not corresponding, how do I know this port can not use?

A:Each module has lights:

 ● Light flash every 3 s, means normal registration card, can be used;

 ● Light flash every 1 s, it isn’t normal registration card, Need to check the card is installed correctly or not.

Q2. You have installed SIM cards,but device can’t read SIM card.
A:Please re-install SIM card and reboot it port, Installing sim card, the direction of the note card is correct.

Q3. COM port have error 2
A:Please reboot this port or re-install this port(Each module is removable).

Q4. Just began to normal to send, but send failure after a period of time

A:It may be blocked by operator or limit, Check the SIM card again orcontact Operator.

• SMS Dongle
• UART HUB
• Power Adapter
• 1FF-2FF（gift）