why is my new iPhone asking for my sprint number and pin to activate my new phone during mirgration if it has already been activated

Hello S_GG,

Welcome to Apple Support Communities, and congratulations on your new iPhone. It looks like when you're transferring your data to your new iPhone it is asking for your phone number and PIN code.

Are you transferring your data from an android or another iPhone? Are you switching carriers as well or with the same carrier? Did you change your phone number? Also, what happens when you enter your iPhone and code?

To get started, please check out these helpful links:

If your iPhone asks you to confirm your phone number when activating in the U.S.

Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch

We hope this information is useful. Kind regards.