Invalid sim

Hi there Ivetv,

You may find the troubleshooting steps in the article below helpful.

iPhone: Troubleshooting No SIM

http://support.apple.com/kb/TS4148

-Griff W.

Hi there

I have iPhone 4S with OS (7.0.3) and recently it keeps showing "Invalid SIM" massage when using 3G service for browsing or after a min of making a voice call (I use Vodafone Egypt network ) so I rest all network settings and changed the SIM with a new one form Vodafone store but problem still exists, I tried to switch SIMs with anther iPhone 4s (7.0.3) however error massage "Invalid SIM" still appear just after browsing using 3G service or after while of making voice call. After error massage appear I lose connection with network until I restart the phone.

Finally I reset my IPhone to the factory setting using iTunes 11.1.2 for Windows7 but problem still exist.

Any advice ???