Hi, Guys,
Just noted the whole issue with SIM900, is the problem solved, I am reading thru the 24 post, alot of work done.
We been using SIM900D for the past 24-month, our recent order of 200-unit, Feb-2012 order was tool problem, it looks like SIMCOM changed the hardware and had firmware issue too, they give us version B10 (orginally supplied with B08, then upgrade to B09, which solve most of the stability issue, but still facing some problems.
Among the problem we faced was CPIN: NOT INSERTED, even though its inserted and this is reported randomly after XX-Min, alot of other issue, Like bogus NORMAL POWER DOWN.
We stoped using this batch and return the unsolder 180 unit to supplier (the soldered 20-unit they refused to give warranty claim, :evil::evil
, they replaced with SIM900A which worked without any problem.
I am not saying this is the solution to original post, I just shooting my experiences and 2-cent worth.
If need be, lets start FRESH, original POSTER, shot the Current Problem, Let me try my luck.
M.Pathma