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  1. Jan 11, 2024 · If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly. If your device has a physical SIM card and you've completed the previous step, 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 ...

    • Make Sure You Have an Active Cellular Plan. While it might seem obvious, it's worth double-checking that your wireless carrier plan (such as with AT&T, Verizon, etc.)
    • Restart your iPhone or iPad. If from out of nowhere you're suddenly seeing an "invalid SIM" or "no SIM" error message, you may have a software glitch causing problems with your device.
    • Perform a Force Restart. If the regular restart didn't work, it's time to try the force restart. If you're unfamiliar with the force restart function, this is just a different way of cutting the power on your iPhone or iPad.
    • Check for a Carrier Settings Update. A carriers settings update comes directly from your cellular provider, and helps to improve cellular network connectivity and provide support for new features.
  2. If your device has a physical SIM card, remove your iPhone SIM card or iPad SIM card from the SIM card tray and then put the SIM card back. Make sure the SIM tray closes completely and isn't loose. If you use a SIM tray from a different model of iPhone or iPad, or from another phone manufacturer, it may not fit correctly. If your device has a ...

  3. Nov 12, 2021 · Turn Airplane Mode On and Back Off. The first thing to try when your iPhone says Invalid SIM is to turn Airplane Mode on and back off. When Airplane Mode is on, your iPhone disconnects from cellular and wireless networks. Open Settings and tap the switch next to Airplane Mode to turn it on. Wait a few seconds, then tap the switch to turn it ...

  4. Dec 21, 2022 · 2. Locate the SIM tray on the top edge of the iPhone. The SIM tray is at the phone's topmost edge at the center, right next to the Power button. 3. Insert the SIM eject tool into the hole of the tray. The hole is on the left side of the tray. Press the tool in gently to eject the tray from the phone.

  5. Oct 23, 2020 · Learn how to remove or transfer the SIM card in your iPhone.To learn more about this topic, visit the following articles:Remove or switch the SIM card in you...

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