Unlocking cell phones with the help of software, is it possible?

HEY, all the cell phone are locked by the network provider when u buy them from any network providing company. What I know is when ever u want to unlock your cell phone special permeation should be taken from the network provider of that particular cell phone. For that u will be charged I cant tell you exactly how much it is.But still if you don’t want to pay for that then there a many software present in the market and on internet which u can use what these software do is just simply provide you unlock code for your cell phone which you have to enter in cell phone when asked to unlock. There are also some sotfware on net which will ask for your cell phones identification number then they automatically unlock your cell phone. You can easily get these software tool on net free of cost.