hi all i have my iphone for how many months now. Its running a 1.1.3 version. Im having problems with my network. Whenever my phone is in standby mode people cannot contact me. Once i open it it shows a network signal then a few seconds later it will show no service especially when i go to settings. I remember having this problem before when i install one app(i cannot remember w/c one) but when i uninstall it, it got fixed. but now what ever i do i cannot fix it. The last app that i install is the "calldata". i already remove it but still not fix. I hope you can help me, im really getting frustrated now. I dont know how to fix it. By the way im living in singapore.