How to check if a GSM module is working or not? I wanted to know if my GSM sim800 is working or not. A mishap occured while I was experimenting around with my GSM module and I arduino uno. The link to the module which I bought: http://www.ebay.in/itm/SIM800-Quad-Band-GSM-Module-with-SMA-Antenna-Better-than-SIM900A-or-SIM900-/301782413058?hash=item4643a22f02:g:8LsAAOSwwbdWMidW I want to know ow can I check if my module is fine?
Power it up and check the 'status' light.  If it blinks with a 1 blink per second cycle, it is attempting to connect to the network.  If it connects, it does a slow blink at 1 blink/3s, it made the network connection.

I don't know if your board does an auto-power-on, but you might need to push the power button or reset button.