I'm shopping carriers as my AT&T contract is coming to an end and I'm not very happy with my Samsung Galaxy Note 5. I like Android but none of the T-Mobile Android phones interest me. I like T-Mobile but what should I do to lesson the cost of switching while swapping to a new phone such as Oneplus 3.
My Note 5 is basically brand new you can't alter them because the bootloader is locked, I've never sold a phone but I suppose I could try to get some money for an AT&T specific Note 5.
First question is can I use a phone such as the OnePlus 3 directly ordered from the company with T-Mobile?
If so, any ideas how to unload an AT&T Note 5? Can T-Mobile give me some credits toward my bill or something?
A site like this one is very helpful.
As you can see there, if you buy the One model of the phone it is fully compatible but most variants are not. You can buy and use any phone you want. Just need to make sure it is compatible with the right bands. Also you might not be able to use all services like Wi-Fi calling.
As far as the note goes, yes you can trade it in for money back. To get the most money for it though, it is better to get it unlocked and then sell it on a site like eBay or similar.
Manage your T-Mobile account