dear all, i am using at89c52 along with SIM300 i am using it for sending/receiving TEXT- SMS one of the program function is to send a SMS whenever SIM300 is turned on (sending sort of initial h/w status through sms) here i am having a problem; coz out of 10 tries i am getting SMS in 7-8 tries only for remaining 2-3 tries it simply doesn't send any sms i am giving 30-sec of delay after powering up the SIM300 as a booting time i don't know why am I not getting 100% result
any suggestion regards