It's an internet connection - so yep .... another ISP
and if it's wireless - it can be intercepted
if it's encoded - it can be decoded
but even a wired connection can be sniffed
the real question with all hacking is - are you worth it
if your shampoo is L'Oreal Elvive you are ...
my recomendation would be don't ... at least not yet
it's expensive inefficient, expensive, slow, expensive, subject to location, expensive .....
I have a BT Broadband anywhere phone - it's great for e-mail - uses windows CE ... and can be used as a modem.
the real advantage is you get free openzone access - and if you join fon - you get access all over europe (where available - I've got to admit - I've never used it)