Hi Ive got my BB 8700g from my brother in US w/c he bought from Ebay with a T-mobile service. I already unlocked the device and IT policy already blank but when i tried to call it always say "call failed". I cannot make a call or send SMS. Please help other details listed below.

using:

Desktop Manager 4.7 (470_b050_multilanguage.exe)
BB 8700 OS: 8700EastAsia_PBr4.5.0_rel75_PL2.7.0.66_A4.5.0.52_T elstra
tried already BB OS : 8700M_PBr4.1.0_rel211_PL2.0.0.111_A4.1.0.258_Globe
location: Philippines
carrier: globe telecoms