I have a iPhone 5s tmobile carrier that I'm trying to sell?

I reported it lost because the screen broke and they wouldn't replace just the screen, they replace it for a complete new phone. But I'm wondering if there would be a problem if I try to sell it for example if they can connect it to tmobile or maybe a different carrier?

If you report it stolen / lost the phone can't be used as a phone anymore (it's locked) without hacking the firmware. You can call apple and get it unlocked though (you have to prove you're the owner).

Get a new one.

If you sell it they're not going to be able to use it unless you give them your apple id & password with it.

how much are you selling it for? I'm interested.