iPhone 12's: Sim Card Problems (No Service, Invalid SIM, No Sim Card or Constantly Searching? FIXED!

I give you several easy possible solutions to fix an iPhone 12, 12 Pro, 12 Pro Max and 12 Mini that has sim card or network issues such as Invalid sim, constantly searching, No service, no sim card, etc. Let me know which method or combo of methods you think worked for you. Hope this helps.
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Also i am not responsible should anything go wrong so do at your own risk!