[Ben B]

I see, under them circumstances yes it would be important to have unlimited usage as you are using your mobile connection as if it were your home broadband connection. Where as the only time I tether is to download a song off iTunes on my iPod when I'm out, the rest of the time my mobile internet usage is limited to just using it on my phone. I just found 3G often too slow or even unreliable in busy areas. I rarely check my data usage though because I never go over, plus I have BT WiFi as part of my tariff.