Unlock a mitto5 phone that I brought at Goodwill

[missy101273]

It is a T-Mobile phone and I didn't realize it . I want to make it work with my At&t account. Please help. Melissa thank you

 

[bignastyid]

http://www.tomsguide.com/forum/id-3765690/call-phone-megathread-find-lost-stolen-phone-unlocking-phones-recovering-data.html