If your iPhone is acting up and giving you the very annoying Invalid SIM or No SIM Installed errors even when you have a fully functional SIM card inserted, then you have come to the right place. In this iPhone troubleshooting tutorial we will show you how you can solve SIM errors on your iPhone and enable the all important functionality.
There are a number of solutions that can solve the Invalid SIM or No SIM Installed errors. Read on to learn about them.
Is your SIM working?
The first thing that you should make sure is the SIM card you have inserted in your iPhone works and is valid. You can make sure of it by inserting it into a different phone and making a phone call with it.
Restart Your iPhone
More often than not the connectivity issues can be resolved by restarting your iPhone. You can even hard reset your iPhone to make sure you cover all grounds.
Try removing and reinserting SIM card
If your iPhone still won’t connect to your cellular network, then try removing the SIM from the SIM tray and insert it again. Also make sure that the SIM tray fits perfectly in the SIM port of your iPhone.
Try with a different SIM card
If you have a different SIM card lying around or if you can borrow one from your friend, then insert a different SIM card to see if it is working or not.
Check for Carrier Settings Update
Does your iPhone require a carrier settings update? You can check this by going to Settings > General > About. When you open this page and an update is available you will get an alert. Simply tap on OK or Update buttons to apply the update.
Make sure you are running latest software
You should install latest version of iOS on your device to make sure you are not having a software related problem. To see if there’s any update available go to Settings > General > Software Update.
Reset Network Settings
You can try to reset network settings on your iPhone to solve SIM connectivity issues. To do so, go to Settings > General > Reset. Then tap on ‘Reset Network Settings’ option.
Restore your iPhone
There are very few issues that a good old software restore cannot fix on an iOS device. Use iTunes to put your iPhone in DFU mode and Restore or Update it to the latest available software. This will reinstall the software on your device and potentially solve the No SIM or Invalid SIM card error.
Still getting No SIM or Invalid SIM card errors? Contact Apple support.