I bought a new iPhone. I want to put my wife's sim card into my old phone. Her iphone is an iPhone 6+. The iPhone I want to put it into is an Iphone 7+. I tried it and it doesn't work.

  • While in the old days, pretty much any SIM card could be swapped into another phone without much effort, nowadays—especially with iPhones—SIM cards are often tied to the iPhone hardware and can only officially be swapped if your carrier allows it to be swapped. Unless you bought an iPhone straight from Apple and placed your own SIM card inside it afterwards, chances of you don’t that kind of swap are slim to none. – JakeGould Sep 25 '18 at 19:13

Are both phones from the same company? Do you have a payment plan for either phone line? Most likely the sim is locked to the hardware from the provider. Usually, they only allow swapping if its a replacement or upgraded device from them.

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