I can`t think why anyone isn`t using Skype!
I can't think of ONE reason why anyone IS using this expensive con!
If you want to call someone with a phone, use your phone - it costs bugger-all in most cases, and only becomes expensive if you're calling the other side of the world.
If have a computer and want to talk to someone with a computer, use MSN - it's FREE, regardless of where either of you are. You have the choice of instantaneous text, video and voice.
I think the only reason ANYONE uses it is so they can go around telling their mates "I use Skype!", because it is somehow seen as fashionable. It is, however, entirely unnecessary.
...as is this Tesco "Internet Phone" nonesense. You still have to be in front of your computer, with your computer on, to use the thing. In which case, just use MSN and save yourself £15!