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did you try calling t-moble and asking them? also you have to have data enabled in order for it too work. You shoudl also have the two roaming settings turned on and also use only 2g networks.
I am not a t-moble user but I googleed this up, idk [SETTINGS] T-Mobile APN Settings
the UMTS radio in the GT540 is incompatible with the t-moble network so 3g/4g will never work. and roaming setting may be necessary depending on what paticular calling plan your useing.
also EDGE is not that slow.