The SIM card acts as the middle man between your iPhone 7 and your cellular provider, giving your device its unique phone number and allowing you to access your carrier's cellular network. Sometimes, removing and then replacing the SIM card back into your iPhone can help if your phone's having trouble accessing Cellular service.

OneSimCard Universal ($29.95) – Coverage of over 200 countries but with a more limited data service (50+) countries. OneSimCard Expedition ($34.95) – Offers much the same coverage as the OneSim Universal travel SIM but with way more data coverage. It’s the choice for the explorers.
Force Restart Your iPhone. Way 3: Check Carriers If iPhone Is Locked. Way 5: Update Your iOS to Fix iPhone SIM Card not Working. Way 6: Reinsert Your SIM Card to Try Again. Way 7: Bypass iPhone SIM Not Supported with iTunes. Way 8: How to Fix Sim Not Supported with Tenorshare ReiBoot.
Tip 6. Update iOS. Tip 7. Restore iPhone to Factory Settings. 1. Turn on Airplane Mode and Turn It off. This is an easy and simple remedy. Visit Control Center and tap on Airplane icon. After about ten to fifteen seconds turn the mode off and see if the SIM Card is getting detected.
Eject the SIM tray. Make sure the card is properly oriented in the cutout. Reinsert the tray and retest. Try the SIM from a friend or family member with the same cellular carrier. If it works, replace your SIM card. You can request one from your service provider, or visit one of their physical locations.
Power on the old iPhone and place it physically near the new iPhone. Power on the new iPhone 12, iPhone 12 Pro, or iPhone 12 Mini, and wait at the “Quick Start” screen. On the old iPhone, tap Continue when you see the “Set Up New iPhone” screen. In a moment, an animation will appear on the iPhone 12 screen, when you see that hold the L5tk.
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    • iphone 7 plus sim card