Default T-Mobile question

would anyone know if say my cousins galaxy s3 won't work anymore and he got a new one, would they take his broken s3? I really wanted his when he upgraded, since T-Mobile does not so two year contracts they can't take it now right?
"A man chooses, a slave obeys." - Andrew Ryan


Samsung Galaxy S2
Rom: Cyanogenmod 10.2.1 (4.3.1)

Rom: Cyanogemod 10.1.3 (4.2.2)
Asus Nexus 7
Rom: Stock (4.4.2) Broken Digitizer, any recommendations on amazon?
Chromecast
Rom: Stock