Iphone 4 unable to unlock

hi everyone, have tried several times unlock iphone 4 ios 4.1 , baseband 2.10.04 have been unsuccessful. have tried preserving baseband , updating latest ios, nothing. furthermore, after jailbreaking it, have tried installing ulstran0w 1.2.5, have failed. appreciate if can me unlocking iphone. thank in advance.

 

2.10 cannot software unlocked. way unlock baseband buy gevey sim

 

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