Q: 9.3.4 Updated Issues - HELP

Hello JSircy,

Thank you for using Apple Support Communities. It's my understanding you've been experiencing issues with your iPhone not responding, sending messages, and providing a SIM card error after updating. I know it is vital to be able to send messages and use your phone without issue. I am happy to help get this resolved with you.

SIM card issues can impact the iPhone in many different ways.I recommend focusing on the SIM card first to see if this resolves all issues. Please try the following steps:

1. Make sure that you have an active plan with your wireless carrier. 
2. Update your iPhone to the latest version of iOS.
3. Go to Settings and turn on airplane mode. Wait about 10 seconds, then turn off Airplane Mode.
4. Restart your iPhone. Press and hold the Sleep/Wake button until you see the slider. Drag the slider to turn off your device. Then press and hold the Sleep/Wake button again until you see the Apple logo.
5. Check for a carrier settings update. Go to Settings > General > About. If an update is available, you'll see a prompt to select OK or Update.
6. Remove your SIM card from the SIM card tray and then put the SIM card back. Make sure that the SIM tray closes completely and isn’t loose. If you use a SIM tray from a different model iPhone or from another phone manufacturer, it might not fit properly.
7. Try using another SIM card. If you don't have one, go to your carrier's retail store and ask them to test with another SIM card. You might need to replace your SIM card.

If you get an alert about the SIM card in your phone

Have a great day!