Q: SIM Not Valid
Why isn't my SIM working?
iPhone 5s, iOS 9, 16 GB un-locked
Posted on Sep 21, 2015 11:02 PM
by Ingo2711,Apple recommended
iPhone
Did you already try the troubleshooting tips mentioned in this article?
If you get an alert about the SIM card in your iPhone - Apple Support
Posted on Sep 22, 2015 2:10 AM