IPhone Says SIM Failure, No SIM Or Invalid SIM – How To Fix It

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What to do if all of a sudden your iPhone says no SIM Card installed, Invalid SIM, or SIM failure? 

This question bothers many users, and it may appear on all iPhone models. If one of the error messages we have mentioned shows up, you won't be able to send or receive text messages, place calls, or use your mobile data plan. Many people want to know what causes these issues. 

There are a couple of reasons why these messages may appear. A glitch in the software is one of them. If the SIM card is damaged or not placed correctly, you may see one of the errors. The issue may appear after an iOS update and if the device came in contact with water.

We suggest that you contact your carrier to ensure that you have an active plan. If everything is fine and your plan is active, try the solutions below.

See also: How To Fix No Service On iPhone 


What to do if your iPhone says "Sim Failure"? 

iPhone Sim Failure error is one of the most common SIM-related issues. We will share several effective solutions for you to get rid of this annoying error message.

Quick Tips


Solution No.1: Toggle Airplane Mode

Let's start with the simplest solution. If you have ever experienced iPhone WiFi issues, cellular data, GPS, or Bluetooth problems, you know that toggling the Airplane mode can fix the issue. This simple trick may work if your iPhone says no SIM.

Go to Settings and turn Airplane mode On. Leave it on for 15-20 seconds then turn it off.

Solution No.2: Reboot your iPhone

When was the last time you rebooted your device? You know that phones can act strangely sometimes. Your iPhone says No SIM Card, even though the SIM card is in the tray. A simple restart can fix the problem.

Press and hold the sleep/wake button and drag the slider once it appears, or press and hold the power and volume down buttons for newer devices. 

Solution No.3: Ensure that your SIM card is inserted correctly. 

Reinserting the SIM card is something you should try. Turn off your iPhone and remove the SIM card. If there is dust in the tray or on the card, wipe it off carefully.  

Make sure the SIM card is not damaged. If your SIM Card is damaged, you will have to contact your carrier for the SIM card replacement. No damage to the card? Place it back in the tray and turn your phone on.

Here is Apple's guide on removing the SIM card from your iPhone.


Solution No.4: Try another SIM card

If you tried the previous solution and it didn’t work, try another SIM card. Turn off your device, remove your SIM, and place another SIM card in the tray. Power on your iPhone and see if the error message appears. If not, your SIM card is causing the problem. Contact your carrier for the card replacement.


Solution No.5: Carrier settings update

When you update the carrier settings, the issue is resolved in many cases. Navigate to:

  • Settings
  • Tap on General
  • Tap on About

If the carrier settings update is available, you will be asked if you would like to update then now—tap Update.

You may also read: How To Fix iPhone/iPad Won’t Download Or Update Apps.


Solution No.6. Call your carrier

Call your carrier if you have tried the "Reinsert SIM card" method and everything seems fine. Ask them if there is an issue with the carrier network. Otherwise, ask them for a SIM card replacement.

See also - What Is ESIM And How To Activate It On iPhone With Your Carrier

Solution No.7: Reset network settings

What's next? You can reset your network settings. This is a handy solution for various connection-related issues.

Resetting the network settings will restore network settings to factory defaults, so you will have to enter your WiFi password and pair them with other Bluetooth devices.

  • Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network settings.
  • Enter your passcode.
  • Tap Reset all settings to confirm your action.


Solution No.8: Upgrade your iPhone to the latest version of iOS

Have you installed the newest version of iOS? If not, do it now. Before we start, make sure your device is charged or connected to a power source. Connect to a Wi-Fi network.

  • Go to Settings > General > Software Update.
  • Tap Download, Install or Install Now (if you have already downloaded the latest version of iOS).


See also - How To Fix The SIM Card Not Provisioned MM#2 Error On Android

What to do if your iPhone says Invalid SIM card or SIM card failure?

The iPhone "no SIM card" error is not the only sim-related message you may see. There are also Invalid SIM cards and SIM card failures. While the reasons for all the error messages are more or less the same, these two usually appear because the sim card has shifted or been damaged.

If you recently pulled the sim out of the phone and the phone was turned on, you may see an Invalid Sim or Sim card failure. Many users with jailbroken iPhones reported these messages. If your device is jailbroken, the only way to fix the problem is to remove the jailbreak.

Here are several suggestions on how to fix an invalid sim card or sim card failure on your iPhone:

  • Restart your iPhone
  • Turn off your phone and remove the SIM card. If the card is damaged, contact your carrier for a replacement. Clean the tray and the card. Put the card back into the tray, but make sure the SIM card is placed correctly. Turn your phone back on.
  • Try another SIM card.
  • Update your iPhone to the latest version of iOS.
  • Restore your device to factory defaults using iTunes or Finder on Mac.

What to do if your iPhone says No Sim, Invalid SIM card, or SIM card failure after an iOS update?

Every new version of iOS brings improvements in performance, security, and bug fixes. However, it may cause temporary hiccups at times, which usually disappear after a couple of hours once your device settles.

See also-  Why My iPhone Won't Connect To WiFi

If the iPhone "no sim installed, invalid card, or sim failure" message didn't vanish even a few hours after the update; you can try the solutions we mentioned in this article:

  • Toggle Airplane mode
  • Restart your device
  • See if the carrier settings update is available
  • Reset network settings
  • Reinsert the SIM card
  • Restore your device to factory defaults using iTunes or Finder on Mac.

If nothing works, contact your carrier or visit one of the Apple Stores nearby.

iPhone No Sim card installed, Invalid SIM card or SIM card failure after water damage

We all know water is one of the biggest enemies of any smartphone. If your iPhone came in contact with water, you need to turn it off first, unplug all the cables, and wipe the water off. What many of us forget to do is to pull out the SIM card.


If you don't do that, water will damage your SIM card. Even if you can turn your iPhone back on and the phone works, you may notice one of the error messages. While you can try the solutions we have mentioned here, you will probably have to contact your carrier for a SIM card replacement.

See Also - APN settings for AT&T, Verizon, T-Mobile, Boost Mobile

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