Emperial_Guard_09
New member
I hate my current boostmobile phone so bad. I wish I could use it on my old T-Mobile phone, which happens to be unlocked. I know there are certain phones, if unlocked, will allow the SIM card of another wireless phone service provider to work with the unlocked phone. I'm pretty sure AT&T and T-Mobile SIM cards are compatible with one another, once the phones are unlocked. But, will a Boostmobile SIM card work in either one of these phones, if they are unlocked?