I give you several easy possible fixes on how to an iPhone that has sim card or network issues such as Invalid sim, constantly searching, No service, no sim card, or keeps disconnecting, etc. Let me know which method or combo of methods you think worked for you. Hope this helps.

This goes for iPhone 4, iPhone 5, 5c, 5s, SE, iPhone 6, 6s, 6s Plus, iPhone 7, iPhone 8, 8 Plus, iPhone X, XR, XS, XS Max, iPhone 11, 11 Pro, 11 Pro Max, iPhone 12, 12 Pro, 12 Pro Max, 12 Mini, iPhone 13, 13 Pro, 13 Pro Max, etc.

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Also i am not responsible should anything go wrong so do at your own risk!