How can I unlock my phone?

I have my phone a blackberry z10, with a report and I want to withdraw it I do not know how, in several pages they charge me up to $ 40 and I think it is not necessary to pay them and in my country it is extremely cost to pay $ 40 in few words I live in Venezuela and it is really cost to pay that amount I used the google engine to find a thousand ways to unlock but all attempts have been unsuccessful and I turn to this page as a last chance.
I have seen that they simply put the IMEI phone and an email to get the activation code but I can not find any person who has that page to unlock it I would appreciate it a lot.
Sorry for my English

You want to unlock the carrier/network of the blackberry? Blackberries usually only cost a few dollars to do on eBay. What network are you on now?