stupid question but, if i use the sat nav (is has got sat nav right?) this won't be something that my network can charge me for using will it? ie it doesn't require the phone line use or does it?? any other info greatly appreciated. oh and the wifi use, same question really- if i go in a cafe with free wifi and use it on my phone- again... chargeable? surely not as they charge for mobile internet use. thanks in advance of any replies.