Cellular development boards
Right-angle Mini GSM/Cellular Quad-Band Antenna - 2dBi SMA Plug is a 2.2" antenna that is flexible and handy.
Adafruit FONA MiniGSM is a cellular module that helps you to communicate via sms,text and voice to your project.
Slim Sticker-type GSM/Cellular Quad-Band Antenna - 3dBi uFL is a GSM antenna that is slim with a perfect fit.
Hook your Arduino up to GSM/GPRS cell phone network with GPRS shield! You can use your Arduino to dial a phone number or send a text to your friend via easy to use AT commands now.