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  1. Sep 16, 2024 · Check for a carrier settings update. Go to Settings > General > About. If an update is available, you'll see a prompt to select OK or Update. If your device has an eSIM, contact your carrier. 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.

  2. Sep 6, 2022 · If you still see an alert about your SIM card, contact Apple support. Following these steps may help with resolving the message you see popping up about the SIM card. If not, follow the link above for contacting Apple Support.

    • Tech Writer
    • Idownloadblog
    • 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.
  3. Oct 10, 2021 · If the tray holds a SIM card it will fall out easily. When reinserting the SIM card, make sure it's in the correct orientation inside the tray. A thin rubber gasket around the SIM tray provides water and dust protection.

  4. Sep 11, 2024 · 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.

  5. iPhone Invalid or No SIM. Is your iPhone not detecting your SIM card? Does it say "No SIM" or warn the SIM is invalid? Have a look at these fixes.

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  7. Apr 4, 2021 · What to Do If Your iPhone Suddenly Displays 'SIM Failure,' 'No SIM Card Installed,' or 'Invalid SIM'? This guide provides in-depth instructions on how to resolve it.