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  1. Sep 16, 2024 · Restart your iPhone or iPad. 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 ...

    • 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. Aug 3, 2024 · Test for a malfunctioning SIM card. If your iPhone still says it has no SIM, your SIM card could have a hardware problem. One way to test this is by inserting a SIM card from another cell phone that you know works fine. If the No SIM Card Installed warning disappears after inserting another SIM, then your iPhone SIM is broken. You can get a new ...

  3. If you receive an alert that says Invalid SIM or No SIM Card installed, follow these steps. Make sure you have an active plan with your wireless network provider. If your iPhone is locked to a network provider, it can only be used with that network provider. To check if your iPhone is unlocked, go to Settings > General > About.

  4. Oct 15, 2021 · If that white sticker has a red dot in the middle, it means that sticker has gotten wet at some point, and water damage can sometimes cause the “No SIM” issue — but not always. Remember that while the SIM card is resilient to water, the internals of the iPhone are not. 3. Reinsert The SIM Tray.

  5. Aug 22, 2024 · If the test SIM card works, then your original SIM card is the problem, and you need to get a new one from your carrier. To get a new SIM card, just reach out to your carrier or stop by their store and explain that your old SIM card is damaged and needs replacing. Some carriers let you swap your SIM card directly through their app.

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  7. Jan 2, 2023 · Turn on your iPhone and navigate to the Home screen. Tap the Settings app. Tap General, scroll down and then tap About. If a carrier settings update is available, tap the prompt that appears to ...

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