I'm confused about Tesco Talk Wifi service. How does it relate to their internet telephone service?

If I had Tesco Internet phone at home (on the PC or using a telephone adaptor) would I be able to use the same account on a compatible Nokia phone via wifi when away from home?

Tesco Internet gives you a local number for incoming calls. Is the same true for the wifi service?

If I was connected by wifi on a Nokia handset say in the office or a hotel, would I be able to receive incoming calls made to that landline number?

Thanks