How to fix "No SIM Card installed" error on iPhone

[Chris Crocker]

If your iPhone is operating and displays a very annoying message that the SIM card is invalid or No SIM has resulted in you being unable to use the service. Now take a step-by-step approach to solving problems with your SIM card when mounting it on your iPhone.

Notice that the SIM is not installed on the iPhone.

Does your SIM card still work?
The first thing you need to make sure is that the SIM card that you have inserted into the iPhone works and is valid. You can be sure of that by inserting it into another phone and making a call with it.

Restart iPhone
One way to help solve that connection problem is to restart your iPhone. You can even reset iPhone to make sure it supports everything and no conflicts.

Try disconnecting and reinserting the SIM card

If the iPhone is still not connected to the cellular network, try removing the SIM card from the SIM tray and inserting it again. Also make sure that the SIM tray works with the iPhone's SIM card.

Try using a different SIM card
If there is another SIM card around or if you can borrow from a friend, insert another SIM card into your iPhone's SIM tray to see if it works.

Check for Update from Service Provider
iPhone may require the installation of a service provider update. You can check this by going to Settings> General> About. When this page opens and updates are available, you will receive an alert. Just click the OK or Update button to apply the update.

Check for updates from your mobile service provider.

Be sure to run the latest software
You should install the latest version of iOS on your device to ensure that it has no software-related issues. To see if there are any updates, go to Settings> General> Software Update.

Reset network settings
You can try resetting your network settings on your iPhone to resolve SIM connection issues. To do this go to Settings> General> Reset, then click the Reset Network Settings option.

Restore iPhone
Finally, the way you can do it is to put iPhone back to its original installation state via iTunes or use the system restore feature. This will reinstall the software on your device and may resolve the problem without a SIM card or a valid SIM card.

Hope that helped!

 

[Dracindo]

While restarting your device is always an option, it usually doesn't solve such nasty error messages. Same for taking out your SIM card and putting it back in again, maybe clean it a bit once it's removed first. Don't get me wrong, the whole "Have you tried turning it off and on again" method is usually what does the trick and it's always worth mentioning, I just find it hilarious and sad that errors like this occur for no proper reason, if simple fixes like these actually solve the problem. Granted, you can't fix every bug, but bugs that can be fixed like this cause a lot of stress to the user.

 

[Rodney Olson]

If ways above didn't work, I would suggest to open SIM tray and make your SIM clean and trying to put it back your smartphone, restart it and see if your problem is solved or not.