You do not have to contact At&t for the line you are transferring to Verizon. When you get the Verizon phone, either call Verizon from another phone # or go to a Verizon store to complete the transfer. You can keep your line active w/ At&t on a month to month basis without any penalty, but I wouldn't suggest you wait more than 30 days to activate the Verizon phone. You could activate the Verizon phone w/ a new mobile # and transfer your At&t mobile # to Verizon later without penalty. Good luck, let us know how it works.
If I'm annoyed and you're annoyed, does that make us a paranoid ??
Sarcasm is a fine art...
"Don't believe everything you think"
It's not a matter of if you win or lose, it's how you assign the blame