I follow the instructions to testing sim900A, but ONLY can receive message/call from another cellphones, NOT call/send from sim900 to any cellphones. Anybody have experiences on this case?
I cannot even sent AT command to test operation status; receive message is okay now; here my logfile. Thank you in advance.
NORMAL POWER DOWN ÿÿÿÿ RDY
+CMT: "+8498???????","Xi l","14/09/28,22:50:44+28" Trying... AT