How can I unlock my nokia 3539 i bought of ebay for free?

Answer 1

There's no such phone as a Nokia 3539 !! What is the real model number?
If your Nokia phone is a DCT4 phone you can use the unlock code calculator on http://www.nokiafree.org
If it is a newer BB5 phone, you cannot unlock, at least not for free unless the original provider will give you the code.