Metro 640

[ibbyj]

Is the Metro PCS 640 locked to metro, or can I use it on Tmobile?

I know that Cricket 640 is locked, and can't be used on parent company ATT.

 

[libra89]

According to this T-mobile support thread (answered by support from T-mobile earlier this year), you can.
https://support.t-mobile.com/thread/82587

Also take note of MetroPCS unlock policy though: https://www.metropcs.com/terms-conditions/phone-unlock-policy.html

Edited to add: It seems like it's your best best to just call MetroPCS support, and see what they say. I am seeing everywhere that you can use their phones on T-mobile.