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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