Hi Barry. Welcome to justanswer.
Switch off the phone. Remove the sim card. Then put it back and turn on the phone and check if you get any networks or not.
Go to Settings-More- Mobile Networks- Network operators. Then your phone will search for available networks. Check if you get any network operator's name there or not.
Do you have any other phone or sim card?
I think the size of the sim will be different. Is it? If not, then put that sim in iphone and check if you are getting signals there or not.
Do one thing, change the sim slot. Remove the sim and put it in the second slot of your phone
Okay Barry, as you wish.
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