Unlock your cell phone

Some mobile phones work with only one network and if you want to change to another operator but your mobile phone is locked for using with your current operator only, so you’ll must unlock it first.

Normally, you can’t do it by yourself at home I mean you can get it done at any phone shop and some charge depends on the phone brand. If you want to do it by yourself and free of charge, I recommend you to use this small software to unlock your mobile phone. I don’t think it works 100% but try it first.
 Download here