This is an evaluation board for the ; everything you need to get started with the cellular module is included on this board. With FTDI's FT232RL connected up to UART0 of the SM5100B you can send AT commands from a PC terminal straight to the module. Project description, more information and ordering can be found at https://www.sparkfun.com/products/9427 FT232RL VCP Drivers: http://www.ftdichip.com/Drivers/VCP.htm SM5100B Datasheet: http://www.sparkfun.com/datasheets/CellularShield/SM5100B%20Datasheet.pdf SM5100B AT Command Set: http://www.sparkfun.com/datasheets/CellularShield/SM5100B%20AT%20Command%20Set.pdf SM5100B SMS App Note: http://www.sparkfun.com/datasheets/CellularShield/SM5100B%20SMS%20App%20Note.pdf SM5100B TCP/IP App Note: http://www.sparkfun.com/datasheets/CellularShield/SM5100B%20TCPIP%20App%20Note.pdf Arduino Tutorial: http://tronixstuff.wordpress.com/2011/01/19/tutorial-arduino-and-gsm-cellular-part-one/