YX 2G GSM Modem 1 Port Bulk Send SMS USB Dongle IMEI Change AT command

Key Features:
● 1 SIM Slot: Plug in any GSM SIM card into this gsm usb modem for instant SMS sending and receiving.
● Bulk SMS Power: Manage thousands of messages daily using reliable gsm modem sms tools.
● IMEI Customization: Bypass carrier restrictions with flexible IMEI changes—ideal for high-volume messaging.
● AT Command Control: Perfect for developers and power users customizing SMS automation through AT commands.
● Plug & Play: Insert the 2g gsm sms dongle into any laptop or desktop USB port—ready to operate in seconds.
● Global 2G GSM Coverage: Supports 850/900/1800/1900 MHz bands, compatible in all regions with active 2G networks.

Why Choose This Dongle?

● Robust Features for Seamless Integration
● Multi-Protocol Support: STK, AT Commands, TCP/IP, SMS/MMS, GPRS, GPS, USSD, and email functionality—making this gsm modem for sms highly adaptable.
● GPRS Class 12 Optimization: Enhanced data efficiency with CS-1 to CS-4 encoding and full support for FTP, HTTP, SMTP, PPP, and PAP protocols.
● Free SMS Caster Software: Schedule, track, and customize campaigns with included tools, fully compatible with your gsm modems deployment.

Built for Reliability & Affordability
● Global Compatibility: Ideal for Africa, Asia, Europe, and other regions where 2G networks are actively used—truly a versatile gsm usb modem solution.
● 12-Month Warranty: Covered by YXCALL’s warranty and full technical documentation for peace of mind.
● Compact & Energy-Efficient: Small, low-power gsm modem sms unit designed for scalable and hassle-free deployment.

Perfect For:
● Marketing campaigns & SMS promotions
● Appointment reminders, OTP verification services
● Small business messaging & developer testing
● Affordable, reliable gsm modem for sms automation

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

Boost Your SMS Reach!

Need bulk SMS made simple? Turn any PC into an SMS hub!
Supports Windows/Linux | Ideal for SMS hubs, alerts, and customer engagement.

Note: Not recommended for regions where 2G networks are phased out (e.g., Australia, USA, Canada, Japan, South Korea).

Questions? Contact customer service ( 9:00 AM - 6:00 PM GMT+8) for compatibility checks or product details!

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

YX International is a professional supplier specializing in consumer electronics, smart devices, and lifestyle solutions—including gsm modems and wireless communication tools. With years of experience in global trade and a robust supply chain network, we provide businesses and end-users with reliable products like gsm usb modem solutions 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—from 2G GSM SMS dongles to IoT accessories—meets high expectations.

        

Why Choose Us

• Extensive Product Range：From smart electronics and lifestyle gadgets to gsm modem for sms deployment tools, we offer diversified solutions to meet evolving market demands.
• Direct-from-Manufacturer Pricing：We partner with trusted factories to deliver products like gsm modem sms hardware at competitive wholesale pricing—no hidden costs.
• Strict Quality Control：Every item, including our gsm usb modem lineup, undergoes multiple quality checks—from factory audits to final inspections—ensuring reliable performance.
• Efficient Logistics Network：Through established global shipping channels, we offer fast, trackable delivery to over 100 countries, ensuring prompt receipt of your gsm modems and accessories.
• Dedicated Customer Service：Our professional team supports your journey from inquiry to after-sales, helping you scale with confidence—whether you're buying one dongle or bulk SMS devices.

FAQ

2、Product Brief

▼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.