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  1. 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. To check if your iPhone is unlocked, go to Settings > General > About.

  2. Dec 8, 2023 · To contact your carrier and unlock your iPhone, use these steps. You can find out if your iPhone is locked by going to Settings > General > About. If "No SIM restrictions" appears next to Carrier Lock, your iPhone is unlocked.

  3. If your iPhone is unlocked, "No SIM restrictions" will appear next to Network Provider Lock (or Carrier Lock). Find out how to unlock iPhone for use with a different network provider. Restart your iPhone or iPad. Check for a network provider settings update. Go to Settings > General > About.

  4. Mar 28, 2023 · This wikiHow teaches you how to remove the security code from your iPhone's SIM card. Doing so will allow you to restart your phone and make calls without having to enter the SIM PIN. You can easily deactivate the PIN in the Settings app.

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    • 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.
  5. Jan 31, 2019 · You only have three attempts to unlock your SIM card via PIN. If you input the wrong SIM PIN three times, your SIM card will be locked — cutting off access to voice and data. Stop inputting anything if you can’t remember your SIM PIN after a few tries.

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  7. Aug 1, 2022 · Learn what to do if your iPhone or cellular iPad isn’t recognizing the SIM card and shows “No SIM,” “SIM Not Valid,” or other SIM-related errors. You can’t make regular calls, use mobile data, or send and receive non-satellite texts if there are SIM-related errors on your iPhone.