Reading everything on the internet I can find. So far I've found the conflicting answers that:
1) As long as it has the network ability, then yes.
2) No unlocked phone will reach above EDGE speeds on another carrier. (May by very outdated, but can't confirm)
3) That might not be correct, unlocked phones will not, normally, work correctly on other networks.
4) It works 100%
5) It can only reach 3G
After several calls I've found out:
1) T mobile says:
a) Should work.
b) No idea.
c) Since it has the network ability to use 4G lte with our network, it should, but I don't know.
a) Just try it.
b) I think so, but I don't know.
3) AT&T (the phone is made for and sold by them)
a) Unlocking will not limit the phone.
Is "No unlocked phone will reach above EDGE speeds on another carrier" just a myth now since "Things has changed" (what ever that means)?