Just updated to iOS 6.1 but getting the iTunes error “There is no SIM card installed in the iPhone you are attempting to activate”? Here are some possible fixes.
This is a rather weird issue because you already have your SIM card inserted but iTunes is saying otherwise.
You can try the following fixes:
1. Take out the SIM card and insert it again (you may have to do this multiple times)
2. If that doesn’t work, try using a newer SIM card (friend’s, wife’s, collague’s etc). Some old SIM cards are not able to activate iPhones running on iOS 5 and above.
3. If that still doesn’t work, visit your nearest network provider and get a replacement SIM card. Be sure to try your iPhone there and then.
If you have an iPhone 3GS with iPad Baseband 6.15.00…
If you have iPad baseband 6.15.00 installed before, for whatever reason iTunes won’t let you activate your iPhone on iOS 6.1. Apple may have quietly put this restriction in place. In case you missed the news, you can now downgrade from iPad baseband 6.15.00 to 5.13.04.
How to Downgrade Baseband iPad Baseband 6.15.00 (iOS 6.1) to 5.13.04