Can iphone 5 be factory unlocked which is locked to Hungary T-mobile?

Hi, my iphone 5 16gb is locked with t-mobile Hungary. IIm tired searching on the net for a solution but just couldnt find it. I've no legal paper so also can't request Tmobile Hungary to unlock it for me. Can any one help me what to do how to do in this case or provide me such a link who can help me unlock this beautifull phone.

If you go on eBay or just search for a R-Sim… You put it in with a T-Mobile sim. And load your phone, and you can then go to Settings>General>About and choose a different network. (this doesn't permantly unlock the phone, it just gives it access to the other network)