The Siemens MC35i Terminal Board is a robust unit with integrated GPRS and Dual-Band GSM functionality.
It allows your project to utilise the full benefits of GPRS technology, such as permanent online connections plus cost-efficient, high-speed data transmission.
These small low power units require DC power and a SIM card

find out more here, with links to datasheets , images and information

For sale 6.99 each !