I recently bought a quad-band SIM900 mini V4.0 GSM board (http://www.ebay.com/itm/SIM900-MINI-V4-0-WirelessData-Transmission-Module-with-Antenna-Cable-for-Arduino-/281493144780). My problem is quite poor documentation about it. I don't know how to properly supply it as well as how to communicate with it using serial communication (not RS232). Is there any of you out there having experience with this board and willing to give me some advice on the topic?
Thank you in advance.