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 Your iPhone could also be saying Invalid SIM because it’s software is out of date.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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