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I cannot see the forest for the trees, so here is my dumb question:"Your old SIM card must be inside your device and your account with your previous provider must still be active so you can receive and respond to the SMS and authorize the request..."...

I am new to cell phones and networks...My daughter provided her old phone, which I will try to activate on Public Mobile (PM).The PM compatibility checker returns the following for my phone:(Check mark)    3G: 850MHz, 1900MHz(!) 4G LTE: Device does n...