Support 800MHZ single frequency independently

Support 900MHZ/1800MHZ frequency automatic selection

Support 800MHZ/900MHZ/1800MHZ three frequency automatic selection

Three kinds of bands can be easily switched by software

Replaced by an internal hardware device that supports 850MHZ band and 1900MHZ bands

Provide a standard UART interface,

Maximum support 115.2Kbps serial rate

Support packet data service support GPRS CLASS10

AMR FR EFR HR support and voice coding

Supports the standard AT command set and extended AT command set

Providing UART Audio SIM card Power Control ADC Interface

GTM900 support the business functions are as follows

Support high-quality voice services to support FR EFR HR and AMR voice coding

To support wireless data services to support the circuit and packet-based data service data service support GPRS packet data service

CLASS10

SMS function support MT and MO

Add business functionality to support caller ID and call forwarding, call transfer Call waiting Call hold

Three-way calling

Support clustering features include group call

GTM-900B/900A/900C agreement with Huawei GSM / GPRS communication module