New phone does not recognize SIM card

magenta10332809

    I got an upgraded phone and put my old SIM in, but it only recognizes the card about half the time. I either get an invalid SIM error message or no SIM detected at all. The door is all the way shut, there is no carrier update pending, and restarting my phone only works sometimes. Do I have to link my new phone to my account somehow, or is this a hardware issue? The new phone is an iPhone 8. Thank you!

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