Raspberry Pi Zero W - one of the most...
This is an A6C GSM/GPRS Module with Camera which is perfect for your project.
The SIM808 with Leonardo mainboard is the latest Arduino board developed by DFRobot for multi-purpose applications.
This is a mini Development board for A6 GSM / GPRS module which is perfect for your projects.
LinkIt ONE (ARMv7 with GSM, GPRS, GPS and Bluetooth)