Fix for iPhone 3G and 3GS activation problems
If your iPhone has been activated through iTunes but still has “No Service” in the upper left hand corner the following may fix the problem.
- Turn your phone on.
- Remove iPhone SIM card using the SIM card removal tool that’s in the black pouch in the iPhone box or a paper clip.
- Wait for “No SIM card installed” message.
- Install SIM card.
You should now be able to use your phone.