Nokia 6133 locked ringtones

Anyone know how I can use my saved music or received files as ringtones..?
I heard somewhere that T-Mobile locks the phone so you can only use ring tones that came with the phone and buy extra ones..although it lets you choose what to use asd a ringtone once you select it says that this option is locked..

Anyone know how to unlock this? or maybe even get a sales rep to unlock it because I am still in the 15 days of the trial

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also i dunno if this should go in the nokia section or here...thanks