@kettch: Yes it does include tethering, an Android first (without jail-breaking).

One thing to note is that when travelling, your connection isn't the best in the world, so streaming,downloading films or checking in code is a pain (so data consumption is higher but not astronomical), The real benefits are not having to pay a fortune to use Wi-Fi if on a train from Edinburgh to London for instance. My usage fluctuates as well, busy months, and quiet ones.

The people that usually run into issues are those replacing their broadband or dial-up  connection full time, with their phones Wi-Fi and expect it 24/7