Remove and Reinsert the SIM Card. If your iPhone 7 can’t find a network suddenly, the problem may lie with the SIM card. Try removing and reinserting the SIM to restore proper connection. To do this: Locate the SIM card slot on the right side of iPhone. Use a SIM eject tool or paperclip to pop out the tray. Remove and reinsert the SIM card I don't think you can use the phone. After a hard reset - Firstly the phone won't set up without an active sim. Secondly find my phone is enabled by default, so even if you did have a sim you wouldn't get pass the first few steps of setting up the phone as it will ask for the password. nano-SIM: iPhone 6 and 6 Plus: nano-SIM: iPhone SE: nano-SIM: iPhone 6S and 6S Plus: If your iPhone 7, 7 Plus, 8 or 8 Plus is having issues finding your network (says no service, constantly searching, invalid sim, no sim card, etc) then make Insert a paper clip or SIM eject tool into the small hole of the SIM card tray, then push in toward iPhone to remove your SIM tray, notice the notch in one corner of the new SIM card. Place the new SIM card into the bottom of the tray — it will fit only one way, because of the notch. Then insert the other SIM card into the top tray. fsMq2CW. If you got the "SIM not supported" message when inserted your SIM card on an iPhone, I will show you how to unlock your iPhone to any carrier using the AT&T

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