PLS help bought an o2 xdaII seller said it was unlocked

[gmr123]

Hi guys, i bought this device as unlocked when i put my mobile world (t-mobile) sim in it came up and said "network is locked input unlock code" i found the unlock zip file on the forum ran it and it said phone is unlocked ????? confusion set in and im still confused can anyone please help -thanks - Graham

[hanmin]

Please state the file and the location (in this forum) which you use to in attempt to unlock your phone.