Does putting my old SIM Card into the iPhone 12 work?

The iPhone 12 came with a SIM Card that says "5G" on the text side. I am wondering if my old SIM Card will allow my new phone to use 5G, or if it would even work at all. Do I need Verizon to do something involving the SIM?

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  • 1 month ago
    Favorite Answer

    No. The SIM card needs to be compatible with 5G. 

    Using a 4G SIM inside a 5G device only allows 4G speeds at maximum.

    Using a 5G SIM inside a non-5G device only allows whatever speed that device is capable of.

  • 1 month ago

    You can put your old SIM into your new iPhone 12 and it will work. However, you will not be able to use the phone's full 5G capacity. You will have access to 5G, but not to the full extent as if you were to use a new 5G SIM.

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