Making calls from your mobile over wifi, instead of your mobile provider’s network, saves lots of money on call charges. This has the obvious consequence of reducing the income of the
bloodsucking mobile operators (all together now, awwwww).
To ensure you can’t do this, some mobile operators have crippled the ability to make Internet calls on the phones they sell you as this video demonstrates:
If your mobile operator has done thisto your phone, shame on them. I presume re-installing the original Nokia firmware on your phone will bring back the Internet calling functionality. Can anyone confirm this?