Thanks for the tips, i just restart my 12 pro and everything went smooth, it is up and running now, should of done that from the beginning...lolwhat i had to do last year with my 11 pro max was swap sim cards from my old phone to the new as i couldnt get it activated either
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try to reboot the new iPhone and you should be good to go, that's what i did and mine is up and running now.Same here, stuck on activating...