A GSM modem is a specialized type of modem that accepts SIM-card, and operates over a subscription to a mobile operator, just like a mobile phone. A new version of SMS is available, it supports the ability to use Android phones as GSM modem devices for both sending and receiving SMS and MMS messages.

 

USR IOT has produced two GSM modems includes USR-GPRS232–730 and USR-GPRS232–734. Both of them are low-cost and industrial design GSM modems. Here follow the functions of GSM modems:

 

Support RS232 or RS485 interface

Support 2G Frequency: GSM850/900,DCS1800/1900, 2G GSM/GPRS

Support GSM/GPRS/EDGE and 2G/3G/4G card, but don’t support 3G/4G network

Work Mode: TCP and UDP Client

Supports register packet and heartbeat packet

Can be remote configurated via SMS

Support multi work modes: SMS transmission mode, network transmission mode and httpsD mode

Support basic instruction set and extension instruction set

 

Hardware flow control RTS/CTS

 

The price of USR-GPRS232–730 and USR-GPRS232–734 is under $50.00. If you need to purchase the GSM modem, we recommend you to buy from the official online shop of USR IOT :

https://en.usr.cn/cellular-modem-router/2g-gsm-modem