iphone4
my iPhone 4 is not read my sim once i tried upgrade in to 8 IOS ?
iPhone 4, iOS 8.1.3
An iPhone 4 cannot be updated to iOS 8.
Only as far as iOS 7.1.2
To see which version is installed, tap Settings > General > About then scroll to Version.
For the SIM issue, help here > iPhone: Troubleshooting No SIM