For anyone looking to use a Sim900 module with their micro project, the older Sim900 modules seems to work in most countries, but there is now a newer, smaller and cheaper Sim 900A mini module being sold on ebay etc.
While a basic search for differences between the 900 and 900A does not seem to show any problems, in fact the A module is locked for use in just the far east.
http://www.blog.zapro.dk/?p=368
Seems the 900A could be hacked to run on the older 900 firmware but for the price difference its worth buying /sticking to the standard 900 modules .
While a basic search for differences between the 900 and 900A does not seem to show any problems, in fact the A module is locked for use in just the far east.
http://www.blog.zapro.dk/?p=368
Seems the 900A could be hacked to run on the older 900 firmware but for the price difference its worth buying /sticking to the standard 900 modules .