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      • 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.
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  2. Feb 16, 2024 · Step 1: Check if Your iPhone 12 is Already Unlocked. First things first, you need to see if your iPhone 12 is locked or not. To do this, insert a SIM card from a different carrier and see if it gets service. If it does, your phone is unlocked! If it doesn’t, don’t worry, just move on to the next step.

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    If you get an alert that says Invalid SIM or No SIM Card installed, follow these steps.

    1.Make sure that you have an active plan with your wireless carrier.

    2.Restart your iPhone or iPad.

    3.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.

    4.If your device has an eSIM, contact your carrier.

    5.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. Make sure that the SIM tray closes completely and isn’t loose. If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly.

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  3. Dec 8, 2023 · Unlocking your iPhone means that you can use it with different carriers. 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.

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    • Unlocking Your SIM Card: Open your iPhone's Settings. This is the grey gear icon on the Home Screen. Scroll down and tap "Phone". It's about a third of the way down the Settings page.
    • Getting an Unlock Code from Your Carrier: Call you carrier's customer support line. Before using one of the numbers listed below, try calling "*611" or "611" --on most phones, this is the default customer support line.
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    • 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.
  4. Apr 19, 2024 · You cant unlock your SIM card without a PUK code. The good news is that you can get this code from your mobile carrier or locate it within your SIM card’s packaging. If you require detailed instructions, here are three ways to find your iPhone’s PUK code.

  5. 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.

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