it says gsm shield sim900 is compatible with arduino. but is it really compatible with arduino MEGA too ?
if so then should i attach sim900 directly with arduino mega or should i use this method or not? (link below). Since i do not have arduino gsm shield. it is sim900 a third party gsm shield.
my gsm shield sim900:
Thanks for help in advance. I will be thankful if anyone help me out.