low price SIMCOM GSM GPRS wireless module

The SIM340 is a Quad-Band GSM/GPRS solution in a compact plug-in module. The leading features of SIM340 make it ideal for applications such as WLL applications and handheld devices. 
- An embedded Powerful TCP/IP protocol stack 

 - Based upon mature and field-proven platform, backed up by our support service, from definition to design and production

General features 
  - Quad-Band GSM/GPRS 850/900/1800/1900 MHz 
  - GPRS multi-slot class 10/8 
  - GPRS mobile station class B 
  - Compliant to GSM phase 2/2+
     – Class 4 (2W @ 850/900MHz) 
     – Class 1 (1W @ 1800/1900MHz) 
  - Dimension: 40mm x 33mm x 2.9mm 
  - Weight: 8 g 
  - Control via AT commands (GSM 07.07, 07.05 and SIMCom enhanced AT Commands) 
  - SIM application toolkit 
  - Supply voltage range 3.4V...4.5V 
  - Low power consumption 
  - Normal operation temperature: -20 to +60
  - Restricted operation temperature: -30  to -20 and +60  to +80 
  - Storage temperature: -40 to +85

Specifications for fax
  - Group 3, class 1

Specifications for data:
  - PBCCH support
  - GPRS class 10: max. 85.6 Kbps (downlink)
  - PPP-stack
  - Coding schemes CS 1, 2, 3, 4
  - CSD up to 14.4 kbps
  - USSD
  - Non transparent mode

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

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

Interfaces
  - Interface to external SIM 3V/1.8V
  - Two analog audio interfaces
  - RTC backup
  - Serial interface and debug interface
  - LCD interface
  - Keypad interface
  - Antenna connector and antenna pad