Samsung Blackjack Red

Only if the phone works with the T-Mobile or unlocked.

You can contact AT & T to obtain the grant / device unlock code. AT & T should release the code. You can then use your T-Mobile SIM card with the device. you also need to contact T-Mobile have adjusted your settings (text, multimedia messaging, Internet, etc.) before you can use these functions

Y do u ****** go climb Mount Everest and ask a dem UNS phresh Asian answer to this question
u can of course

Yes as long as the phone uses a chip that will work as well