Early upgrade but would like to use an unlocked phone

epiloso

    I still have a balance on my EIP and am eligible for an early upgrade. I have an unlocked Galaxy S10+ (which was a Tmobile device to begin with) and would like to use that phone. I'm sure I'd be able to 'upgrade' my line to this new phone but would I still have to keep paying off the old phone's EIP or is there a way that I can return my old phone back to T-Mobile to stop payments on the old device? Thanks!

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