hi guys, this is odd to post but i checked my samsung galaxy ace with other SIM too. still msg sending fails often so that i want to resend again and again to send a msg. Problem arises which connecting a call too. i'm using android version 2.3.6. i have used the same SIM in other mobiles and its working fine. Can anyone help whats the problem with galaxy ace??? Should i factory reset or again flash the android os 2.3.6 using odin??? Thanks in advance!!!