How to fix “invalid SIM” or “no SIM” issue on iPhone

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What you need to know:

  • If the iPhone does not detect the inserted SIM card, the iPhone will display’SIM is invalid‘ Also ‘No SIM card‘message.
  • There are many ways to fix this problem, but the basics are:
    • Make sure the SIM card is active
    • Airplane mode on / off
    • Rebooting the iPhone, etc.

The iPhone is known for its excellent cellular reception, but you may face connectivity issues. This includes issues such as the iPhone not detecting the SIM card and always displaying “SIM is invalid” or “SIM card is not installed”. This is usually the result of a software bug, but there are several other factors as well.

If you’re facing this problem, don’t worry. Follow the steps below to find the fix.

  1. Make sure the SIM card is active
  2. Turn airplane mode on / off
  3. Restart your iPhone
  4. Update iPhone
  5. Check for carrier settings updates
  6. Check if the SIM has a pin
  7. Reinsert the SIM card
  8. Reset network settings
  9. Factory reset iPhone
  10. Try another SIM card
  11. Contact carrier and Apple Support

1. Make sure the SIM card is active

If the SIM card you just inserted into your iPhone has been inactive for more than a few months, your mobile operator may have temporarily or permanently disabled SIM services, depending on your terms of service. ..

Contact your mobile operator to see if your SIM card is valid and you have a valid plan.Some carriers also show plans SettingCellularCellular plan..

2. Switch airplane mode on / off

To quickly fix mobile phone issues, turn airplane mode on and off on your iPhone. Therefore, turn on airplane mode on your iPhone, wait a few minutes, and then turn it off.

Follow the steps below to turn on the plane on your iPhone.

  1. Summon Control center;
    1. For iPhone with Touch ID: Swipe from bottom to top.
    2. For iPhones that use Face ID: Swipe from top to top.
  2. To switch Airplane mode..
  3. Wait a few minutes and switch off Airplane mode..

    Turn on airplane mode-turn on your iPhone

3. Restart your iPhone

Restarting your iPhone is usually another reliable step that bears fruit. Go ahead and restart your iPhone. If you don’t know how, read the guide on how to restart your iPhone (all models).

4. Update iPhone

As mentioned earlier, the “invalid SIM” issue may be due to a bug in the iPhone software. Apple is constantly fixing bugs, so updating the iOS version may resolve this issue. To update your iPhone

  1. Open Setting..
  2. Move to Universal → Tap Software update..
  3. select Download and install..

    Check iOS updates and fix errors that failed cellular updates

  4. option: Can also be turned on Automatic updating..

5. Check for carrier setting updates

Updating your career settings may seem like a foreign concept, but believe me. It will help you solve your problem. Follow this guide to find out how to update your carrier settings on your iPhone.

6. Check if the SIM has a pin

The SIM card lock is less noticeable than it was a while ago. However, the person who gave the call may have mistakenly set the PIN on the SIM card. If you know your PIN, you can easily unlock your SIM, but if you don’t know your PIN, it’s best to ask your mobile operator for help.

However, if you want to troubleshoot the issue before contacting your mobile carrier support, check with the explainer on how to unlock the SIM card locked on your iPhone.

7. Reinsert the SIM card

If airplane mode doesn’t work, the answer may be to remove and replace the SIM card at an old school.

  1. Switch off Your iPhone.
  2. To remove SIM tray SIM card using the ejector tool that comes with the box.
    On iPhone 4 and above, the SIM tray is on the right side. From the original iPhone to the iPhone 3GS is at the top.
  3. If the SIM card is dirty, wipe it with a cloth and put it back in the SIM tray.
  4. Now reinsert SIM tray..

8. Reset the network settings

This is a cellular network issue and you may be able to resolve it by resetting the saved network settings. No data other than Wi-Fi passwords, stored Bluetooth devices, etc. will be lost. Still, back up your iPhone before proceeding to reset. Here are some guides to help you back up your iPhone.

  1. Open Setting Tap Universal..
  2. select Transfer or reset iPhone and tap Reset network settings..
  3. Now tap Reset network settings..

    Reset iPhone and iPad network settings

  4. Enter password Confirm your selection.

9. Reset iPhone to factory

Resetting your iPhone to factory settings will erase all data from your iPhone. We recommend that you make a backup and then reset your iPhone to factory reset.

10. Try another SIM card

This method won’t solve the problem, but it will help you understand if your iPhone has a hardware problem. Use an active SIM on another device. If you see the same error, then there is a problem.

This is no longer a software issue, but a SIM detector issue. If your iPhone is under warranty or covered by Apple Care Plus, Apple will handle this issue.

You can also try using the current SIM, which was not detected by other devices. If none of your devices detect it, contact your mobile operator.

I’ve talked about this earlier, but I’ve tried all the steps above, so if you think your SIM card is disabled or has a problem, contact your mobile operator.

If you have a hardware problem with your iPhone and you think your SIM card works fine on other devices, please contact Apple Support.

We hope this guide will help you solve the problem. The iPhone is currently detecting the SIM card. Let us know in the comments below which steps worked. If you still encounter this issue, please leave a comment. We will support you as much as possible.

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