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  1. Jan 11, 2024 · 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.

    • 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.
  2. Nov 12, 2021 · Reseating the SIM card in your iPhone can fix several minor issues. Look for the SIM card tray on the side of your iPhone. Use a SIM card ejector tool or a straightened out paperclip to open the tray.

    • Gaurav Bidasaria
    • Insert SIM in Another iPhone. A good way to crosscheck if the SIM failure error is showing due to SIM or some iPhone setting is to insert the SIM card in another iPhone.
    • Check if Carrier Plan Has Expired. Check your mobile carrier’s app or web page with your subscription account to check if your plan is still valid. You can call your carrier to ensure your plan has not expired.
    • SIM/eSIM Is Locked. For security, every SIM card has a specific PIN (Personal Identification Number) to lock it. This is done to avoid unauthorized access to your SIM and using to make calls and send messages.
    • Is iPhone Locked to a Carrier. You can buy iPhones directly from the carrier along with a mobile service plan. That means your iPhone can only be used with that particular mobile carrier’s SIM card or eSIM.
  3. Nov 30, 2021 · Sometimes the solution is incredibly simple, such as a software bug fixed by restarting your device or cleaning dust off of your SIM card. We'll cover the top solutions to get the SIM card on your iPhone or iPad working again.

  4. Nov 12, 2021 · An Apple expert explains what to do when your iPhone says "Invalid SIM" so you can fix the problem and continue making calls and texts.

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