If your iPhone says Invalid SIM, you’re experiencing an issue with your iPhone specifically. Borrow a friend’s SIM card and insert it into your iPhone. This step will help us determine whether you’re dealing with an iPhone issue or a SIM card issue. If it still says Invalid SIM on iPhone, move onto our next SIM card troubleshooting step. Make sure the SIM card is properly positioned in the tray and reinsert it. Don’t be surprised when your iPhone says No SIM when you open up the SIM card tray. You’ll have to apply a fair bit of pressure to get the tray to actually eject. Use a SIM card ejector tool or a paper clip and press down in the small circle on the SIM card tray. On the earliest iPhones (original iPhone, 3G, and 3GS), the SIM card tray is located on the very top of the iPhone. On most iPhones, the SIM card tray is located on the right edge of your iPhone. Try ejecting the SIM card from your iPhone, then putting it back in. If you recently dropped your iPhone, the SIM card may have been knocked out of place. So far, we’ve worked through a lot of iPhone troubleshooting steps. If it says “Your iPhone is up to date”, no iOS update is available right now. If an update is available, tap Download & Install. To check for an iOS update, go to Settings -> General -> Software Update. Apple’s developers often release new iOS updates to fix software bugs and introduce new features.

Your iPhone could also be saying Invalid SIM because it’s software is out of date. Wait a few seconds, then press and hold down the power button or side button to turn your iPhone back on.

Swipe the red power icon from left to right to shut down your iPhone. If your iPhone has Face ID, press and hold the side button as well as either volume button.

To begin turning off an iPhone without Face ID, press and hold the power button until slide to power off appears. They’ll have a fresh when you turn it back on. By turning your iPhone off and back on, we allow it to shut down all of its programs naturally. Sometimes it’ll say Invalid SIM on your iPhone simply because of a minor software crash.

If no pop-up appears, a carrier settings update probably isn’t available! Restart Your iPhone Wait here for about 15 seconds - if a carrier settings update is available, you’ll see a pop-up on your iPhone display. To check for a carrier settings update, go to Settings -> General -> About. Apple and your wireless carrier will frequently release carrier settings updates to improve your iPhone’s ability to connect to cellular towers. Next, check to see if a carrier settings update is available on your iPhone.

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