That will be difficult logan... unlocking can be done without payment, if you have the tools yourself. But, you have to pay someone / service provider as they need your IMEI to look up the code from the vendor or carrier.
Try the carrier you are with or visit a small mobile shop who can help.
Answers & Comments
What is your mobile model? There are some free unlock websites like Unlock-free.com where you can get an unlock code without spending a penny.
That will be difficult logan... unlocking can be done without payment, if you have the tools yourself. But, you have to pay someone / service provider as they need your IMEI to look up the code from the vendor or carrier.
Try the carrier you are with or visit a small mobile shop who can help.