After paying off a phone is there a fee that has to be paid before someone can actually own the phone and change numbers?

My sister paid off her iPhone8+ and told me I could switch my number on it. We are on a shared plan and so I have to do this through the plans main person. The main person said that after the phone was paid off we could not switch numbers till a $200 fee was paid to own the phone. He claimed that we only paid off the lease on the phone but until the fee was paid we could not switch. 




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