Starting a plan on a new phone without a number from prior phone

I would like to buy an iPhone 13, but I’ve never had a number before and can only buy a phone if I put in a phone number. I would like to have my phone under TMobile but they also need a phone number and said they’d transfer that supposed number to my new phone.

if I used a friend’s phone to order a TMobile IPhone from the apple website, would they take that phone number from that person when starting the plan?