This post explains for the GSM, GPS, GNSS module.
The Part Number is SIM908.
The function of this semiconductor is quad band module and simple GSM and GPS functionality.
Preview images :
“What extra does SIM808 modules give me compared to SIM908 module?”
SIM808 GSM/GPS modules have a inbuilt Bluetooth stack compliant with 3.0+EDR & FM radio support, Audio recording, SSL security for data transmission, More sensitive Navigation system with GNSS capability with sensitivity of -165 dBm(Read more about dBm here) compared to the GPS only SIM908 with sensitivity of -160dBm.
GNSS is GPS+GLONASS a terminology used if the device supports navigation using USA satellites (called GPS) and Russian Satellites (called GLONASS). So, SIM908 can only track using American satellite systems where as SIM808 can acquire location fix using American and Russian satellite navigation systems, which is helpful when one system is not able to provide accurate location with good signal strength, we can always switch to other system for better results.
SIM808 module comes in a very compact size of 24*24*2.6 mm dimensions compared to SIM908 which comes in 30*30*3.2mm package.
1. Quad-Band 850/900/18001900MHz
2. GPRS multi-slot class 10
3. GPRS mobile station class B
4. Compliant to GSM phase 2/2+-Class 4 (2 W @ 850/900 MHz)-Class 1 (1 W @ 1800/1900MHz)
5. Control via AT commands (GSM 07.07 ,07.05 and SIMCom enhanced AT Commands)
6. SIM application toolkit