[Android Central Question]

I am giving my phones back to sprint and want all of my data and contact on my new Google fi phone.

[hallux]

If your contacts are in your Google account, they will populate on the new phone automatically when you sign in to that same account during setup. If they are not in your Google account you MIGHT have some success using the transfer tool (if you're getting a Pixel device) but you'd be best off moving them all to your account to make the transfers in the future easier.