1)GSM GPRS GPS module,GSM GPRS module SIM900B SIM900 SIM900D SIM900BE
2)The SIM900B offers the same features as the SIM900BE

SIM900B, GSM GPRS GPS module,GSM GPRS module SIM900B SIM900 SIM900A SIM900D

The SIM900B offers the same features as the SIM900BE apart from the on-board SIM holder.

- GPRS class 10: max. 85.6 kbps (downlink)
- PBCCH support
- Coding schemes CS 1, 2, 3, 4
- CSD up to 14.4 kbps
- USSD
- Non transparent mode
- PPP-stack
 
Specifications for SMS via GSM/GPRS
-  Point to point MO and MT
- SMS cell broadcast
- Text and PDU mode
 
Drivers
- MUX Driver
 
Specifications for Voice
- Tricodec
  – Half rate (HR)
  – Full rate (FR)
  – Enhanced Full rate (EFR)
- Hands-free operation
(Echo suppression)
 
Interface
- Interface to external SIM 3V/ 1.8V
- analog audio interface
- RTC backup
- SPI interface
- Two Serial interfaces
- Antenna pad
- I2C
- GPIO
- PWM
- ADC
 
Compatibility
- AT cellular command interface
 
Approvals(planning)
- CE
- FCC
- ROHS
- PTCRB
- GCF
- AT&T
- ICASA