![]() It could either be a minor software crash or your iPhone behaving strangely, whatsoever it is wise to reboot your iPhone now and then. Starting from the simplest ways, you can fix the issue by following the different methods explained below. ![]() How to Fix ‘SIM Card Not Valid’ on iPhone? You May Like: Fix Phone Screen Keeps Going Black Such cases occur mostly due to restrictions placed by such network providers.Ĭarrier problems: Such problems usually arise when you travel interstate or internationally and your iPhone is troubled by your GSM carrier. Service provider restrictions: sometimes you won’t be able to switch between different carriers, such as from Verizon to AT&T. ![]() It could be for various reasons explained in the article later. SIM Not Valid: your iPhone could prompt this once you insert your SIM card. SIM not supported: if your iPhone prompts this, it simply means that the SIM card is not activated.
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