SIM800 Development Board: What is the Operating voltage of SIM800 Development Board? Answer: It needs +5V 2Amp power supply to work.
Bandspeed Adaptor with 5V 2.6A:
http://www.e-gizmo.net/oc/index.php?route=product/product&product_id=46621 ...
SIM800L GSM Module Microsim Card Board: Is this compatible in Arduino/gizDuino? Answer: Yes, but you need to consider first what are the required power supply and other components for SIM800L module. (See the Datasheet)
SIM800L module's input power ...