YX 4G LTE 2 Ports Set USB Dongle Bulk send SMS Modem High speed Internet access

🔥 Why It’s Essential:
✔️ Dual SIM Slots: Run 2 SIMs for 2x SMS capacity or backup 4G internet.
✔️ 4G LTE Speed: Stream, browse, and work at 150Mbps.
✔️ Bulk SMS: Approximately 3600 SMS per port per hour.
✔️ Zero Setup: USB plug-and-play for laptops/desktops—ready in seconds!

🚀 Perfect For:
→ Marketing teams blasting promos
→ Remote workers needing reliable internet
→ SMEs automating customer alerts
→ Developers building SMS/IoT solutions

💡 Key Benefits:
✅ Cost Saver: No extra hardware—combine SMS + internet in one device.
✅ Global 4G: Works in 100+ countries.
✅ Compact Design: Smaller than a mouse—take it anywhere!

Launch Faster, Spend Less, Do More!

Need 4G + SMS in one tool?
📡 Click Now—Boost Productivity Today!
Supports Windows/Linux/Android | Free SMS software options available.

Order Now & Unlock Dual Power! 🚀📲

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）