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  1. Downgrade/Update iOS Without Losing Data. 1 Click to Bring Your iPhone Back to Normal. Tenorshare ReiBoot® System Repair Tool for all iPhone, iPad, and iPod touch. No Data Loss!

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      • If you get an alert that says Invalid SIM or No SIM Card installed, follow these steps. Make sure that you have an active plan with your wireless carrier. If your iPhone is locked to a carrier, it can be used only by that carrier. To check if your iPhone is unlocked, go to Settings > General > About.
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  2. Sep 16, 2024 · If you get an alert that says Invalid SIM or No SIM Card installed, follow these steps. Make sure that you have an active plan with your wireless carrier. If your iPhone is locked to a carrier, it can be used only by that carrier.

  3. Nov 12, 2021 · An iPhone usually says a SIM is not supported because your iPhone is locked to your carrier. This means you can’t insert a SIM card from a different carrier if you switch. To check if your iPhone is locked, open Settings and tap General -> About -> Carrier Lock .

  4. Sep 3, 2024 · Try Basic Fixes. Remove and re-insert the SIM card: If your SIM card won’t work with your new iPhone, eject the SIM tray on your iPhone. Then, remove the SIM card and place it...

    • Sumukh Rao
    • Lead Editor
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    • August 27, 1998
  5. May 22, 2024 · As the phrases suggest, “No SIM Card Installed” or "No SIM Card Available" means that your iPhone believes the Subscriber Identity Module (SIM) is missing. That’s typically the...

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    • Enable and disable Airplane mode. First, go to iPhone Settings or the Control Center and turn on Airplane mode. After waiting for about 15 seconds, please turn it off.
    • Turn on the SIM line. If you use two SIM cards and it shows No SIM, go to iPhone Settings > Cellular > tap a SIM and enable the switch for Turn On This Line.
    • Restart your iPhone. Often, the most frustrating problems are fixed by a simple restart. If you’re getting SIM card errors on your iPhone, turn it off and after waiting for a minute, turn it back on.
    • Gently wipe and reinsert the SIM card. Sometimes after restarting my four-year-old iPhone, I would get the SIM Not Valid or No SIM Card message even though a functioning card is inserted.
  6. Aug 22, 2024 · Short Summary. The “Invalid SIM” or “No SIM” error mostly results from SIM card issues, a software glitch, some hardware failure, or network problems. Thankfully, it’s easy to fix it by restarting your iPhone, updating iOS and carrier settings, ensuring the SIM card is properly placed in its try, or trying a new SIM card or eSIM.

  7. Reinsert the tray and retest. Try the SIM from a friend or family member with the same cellular carrier. If it works, replace your SIM card. You can request one from your service provider, or visit one of their physical locations. As a workaround, use your phone’s eSIM instead.

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