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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
    • Male
    • August 27, 1998
    • SIM Card. Your SIM card is actually a small computer chip embedded into plastic so it can be transferred easily across devices. Although they are resilient, they can become faulty, or may not be compatible with the phone you’ve transferred it into.
    • Phone is Carrier Locked. Especially in the US, where the cost of a cell phone is often paid off in installments, service providers implement locks to prevent you from utilizing your equipment with competitors.
    • Software Bug. Occasionally, incompatible or corrupted software can cause network issues with an iPhone. It is infrequent, but worth ruling out before embarking on deeper level hardware fixes.
    • Faulty SIM slot. This occurs most frequently on newer models of iPhone. Beginning with the iPhone XR, some models feature a Apple iPhone Parts. On previous models, the slot is soldered onto the logic board.
    • Remove the iPhone SIM card and reset it. Since the No SIM problem is often caused by the SIM getting slightly dislodged, the first fix is to try to put it back in place and make sure it's fully seated.
    • Restart iPhone. If your iPhone still doesn't recognize the SIM, try the all-purpose fix for many iPhone problems: a restart. You'd be surprised how many issues are solved by restarting.
    • Turn Airplane Mode On and Off. If you're still seeing the SIM error, your next step is to turn Airplane Mode on and then off again. Doing this can reset the iPhone's connection to cellular networks and may resolve the problem.
    • Update iOS. If the problem continues to persist, check to see if there's an update to the iOS, the operating system that runs on the iPhone. You'll want to connect to a Wi-Fi network, or a computer, and have a decent amount of battery life before you do this.
  5. Nov 12, 2021 · To check for an iOS update, go to Settings -> General -> Software Update. If an update is available, tap Download & Install. If it says “Your iPhone is up to date”, no iOS update is available right now. Eject and Reinsert Your SIM Card. So far, we’ve worked through a lot of iPhone troubleshooting steps. Now, let’s take a look at the SIM card.

  6. Aug 22, 2024 · If you see “Invalid SIM” or “no SIM” on your iPhone, it indicates the SIM card or its firmware is malfunctioning and can’t connect to its carrier as a result. When this happens, you won’t be able to send/receive messages or place/receive calls via the SIM card except for emergency calls.

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