Have you ever noticed that the worst part about owning a mobile phone is the fact that is accepts only a certain type of SIM card? After all that money you've paid for it.Wouldn't you like to get rid of that problem? After all, purchasing another mobile phone for that second SIM card you have but hardly use seems a little extreme. Switching through SIM cards on the same phone is better!NokiaFREE Unlock Codes Calculator is a tiny mobile phone application that, you've guessed it, it's free - the secondary most beloved four-letter word in the English language.This tool requires a fast installation, after which you will see a simple interface with a few drop-down lists and buttons.All you have to do it enter the IMEI number of your mobile phone, your country, and your mobile service provider, after which you receive a bunch of codes you have to input into your phone.And there you have it! NokiaFREE Unlock Codes Calculator is not a complex program, and we sure love the simplicity of it. All mobile phone owners should have this type of software installed on their computer, because you never know when you might actually need it.