SIM808 Module GSM GPRS GPS Development Board IPX SMA with GPS Antenna for Arduino Raspberry Pi Support 2G 3G 4G SIM Card|Integrated Circuits| - AliExpress
Modul with SIM800L V2.0, GSM GPRS, antenna | GM electronic COM
Raspberry Pi GSM/GPRS Board (SIM800) - PiShop.us
GSM GPRS Module SIM800L Module IPX Antenna Interface 4 Frequency 5V USB to TTL Serial Port