PHONE DETAILS::

Iphone 3g ,   8 gb,   3.1.3 baseband 5.12.1

AT&T contract is over.

how can I unlock this . I am going to Nepal tomorrow so need to at least unlock it if not  jailbreak. 

I spoke with at&t representative, though i suspended the service but they told me that neither Apple or at&t can unlock iphone. 

I can see many software, in ebay to unlock. 

Can any Iphone Guru put some light on this?

how can i unlock it, i just have 1 day.

 

appreciation on advance,