SIMCom presents a  compact and reliable wireless module-SIM900S which is compatible with the module-SIM300. This is a complete Dual-band GSM/GPRS module in a B2B type and designed with a very powerful single-chip processor integrating AMR926EJ-S core, allowing you to benefit from small dimensions and cost-effective solutions. The target market of SIM900S is China mainland and India. 

 SIM900S delivers GSM/GPRS 900/1800MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption. The leading features of SIM900S make it ideal for applications such as WLL applications and handheld devices.
 

  General features
* Dual-Band 900/ 1800MHz
* GPRS multi-slot class 10/8
* GPRS mobile station class B
* Compliant to GSM phase 2/2+
  – Class 4 (2 W @900 MHz)
  – Class 1 (1 W @1800MHz)
* Dimensions: 40*33*3 mm
* Weight: 7g
* Control via AT commands (GSM 07.07 ,07.05 and  
  SIMCOM enhanced AT Commands)
* SIM application toolkit
* Supply voltage range :3.2 ... 4.8V
* Low power consumption: 1.0mA(sleep mode)
* Operation temperature: -20 °C to +60 °C

 Specifications for Fax
* Group 3, class 1

 Specifications for GPRS Data
* GPRS class 10: max. 85.6 kbps (downlink)
* PBCCH support
* Coding schemes CS 1, 2, 3, 4
* PPP-stack

 Specifications for CSD Data
* CSD up to 14.4 kbps
* USSD
* Non transparent mode

Specifications for SMS via GSM/GPRS
* Point to point MO and MT
* SMS cell broadcast
* Text and PDU mode

 Software features
* 0710 MUX protocol
* Embedded TCP/UDP protocol
* FTP/HTTP

 Specifications for Voice
* Tricodec
  – Half rate (HR)
  – Full rate (FR)
  – Enhanced Full rate (EFR)
* Hands-free operation
  (Echo suppression)
* AMR
  – Half rate (HR)
  – Full rate (FR)

 Interfaces
* 60 PIN Board-to-board connector
* Two analog audio interface
* RTC backup
* SPI interface
* UART interface
* SIM Interface 
         - Option1: SIM holder (to external SIM 3V/ 1.8V)
         - Option2: Embeded SIM
* Keypad
* GPIO
* PWM
* ADC
* Antenna connector

 Compatibility
* AT cellular command interface