YX 4G LTE 4 SIM Ports Set USB Dongle Bulk send SMS Modem High speed Internet access

Compact Power for Bulk Messaging
The YXCALL 4G LTE Multi-SIM Dongle offers 4 ports for SMS batch processing. With plug-and-play architecture and high transmission speed, it's a top-tier option for users needing a compact yet powerful best sms gateway provider device.

Support for Global Networks
This device works seamlessly across major providers like verizon sms gateway, att sms gateway, and can integrate easily into gmail sms gateway workflows, giving you worldwide coverage from a single unit.

Perfect for Batch SMS Sending
Whether you're running bulk campaigns or automated verifications, this device allows concurrent SMS transmission, making it one of the best bulk sms provider tools available in a dongle format.

Easy to Integrate and Use
Supporting multiple UARTs and USB dongles, this model requires no complex setup. It’s ideal for users wanting to buy sms gateway hardware that delivers immediately without technical friction.

Built for Speed, Designed for Scale
The dongle's LTE support ensures fast, uninterrupted messaging, while multi-SIM functionality makes it a great fit for growing teams needing a reliable sms gateway provider for daily use.


Detailed Description:

Unleash High-Speed SMS & Internet! This 4G LTE USB Dongle with 4 SIM slots is your all-in-one solution for mass SMS campaigns, alerts, or IoT projects—combining speed, flexibility, and affordability.

Key Features:
● 4 SIM Slots: Send/receive 3,600 SMS/hour per port—scale campaigns effortlessly.
● 4G LTE Speed: Enjoy 150Mbps internet alongside SMS operations.
● Free SMS Caster Software: Schedule, track, and automate SMS workflows.
● AT Command & IMEI Control: Customize for APIs, IoT, or carrier compatibility.
● Plug-and-Play: USB-ready for PCs/laptops—no drivers needed!

Why Choose This Dongle?
→ Cost Saver: Replace multiple devices with one compact tool.
→ Global 4G Support: 700-2700MHz bands for 100+ countries.
→ Multi-OS Compatibility: Windows, Linux, Android.
→ Dual Function: Bulk SMS + high-speed internet in one device.

Perfect For:
● SMS marketing & promotional blasts
● OTP/verification systems & appointment reminders
● IoT/M2M data transmission & remote monitoring
● Startups needing budget-friendly SMS tools

Tech Specs:
Network: 4G LTE (GSM/CDMA/WCDMA)
Ports: 4 SIM slots via USB
Speed: ~3,600 SMS/port/hour
Modules: EC25/EC200A/EC20c
Warranty: 12 months

Start in 3 Steps:
1. Plug into USB.
2. Insert SIMs.
3. Launch via SMS Caster!

Free Software | one year warranty | 24/7 Support 

Why YXCALL?
● Auto-SIM Rotation: Prevent carrier blocks effortlessly.
● Compact Design: Smaller than a mouse—portable for fieldwork.
● Developer-Friendly: Integrate with Python, Excel, or APIs.

Need Bulk SMS Made Simple?
*Includes SMS Caster & EC25/EC200A Modules.*

Customize Your Setup! Contact customer service (GMT+8: 9:00 AM - 6:00 PM) for bulk orders, SIM converters, or technical support.

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

How do I install and start using the YX 4G LTE 4 SIM Ports USB Dongle?

Our bulk SMS USB modem dongle is plug-and-play with no driver installation required. Simply insert up to four SIM cards, connect via USB to Windows, Linux, or Android systems, and use the pre-installed Free SMS Caster software to schedule and manage your SMS campaigns quickly and efficiently.

Can I integrate the USB SMS modem with AT command into my own software?

Yes, our dongle supports USB SMS modem with AT command functionality and IMEI control, enabling full API integration for automated SMS workflows or IoT uses. Our technical team can provide guidance to help you utilize these features within your custom applications.

Is the device compatible for global use and bulk SMS campaigns?

Our modem covers global 4G LTE frequency bands from 700 to 2700 MHz, supporting over 100 countries. It handles high throughput with approx 3,600 SMS per port per hour, making it ideal for businesses looking to buy bulk SMS online for campaigns, notifications, or OTP verification worldwide.

What should I do if the SIM card is not recognized or SMS sending fails?

If the SIM card isn’t detected, we recommend reinserting the card correctly and rebooting the dongle port. In cases of send failure after initial success, it may be due to operator restrictions; checking your SIM’s status or contacting your carrier usually resolves the issue. Our support team is ready to assist.

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

​

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）