thanks Mr. aratti i really approtiate your fast replay.

i got that i must delete the old message so that when i write at+cmgr=1 read the last recieved.but here there is a problem is that the mobile will be connected to devices so when i send sms it switch the device on what if i want to switch the device off after few hours so i'll send a new sms sot the mobile won't read it because the mobile won't read the last recieved sms.

i wish you could understand me. and i wish u can tell me how can i deal with this problem.