Used this Fone with Ultra MVNO, how can I get it unlocked?

quadp

    Hello purchased this fone from best buy Feb2006 and used it with my Ultra service. I am no longer with Ultra and contacting tmobile requires a valid fone/account. I am away from the States and need to unlock it from tmobile network.

     

    How can I contact Tmobile as you can only initiate a contact if you have a valid account with tmobile?

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