It looks like Voicestick started something
It might be interesting in conjunction with their freeB offer of 30 minutes of free calls per day for a one-off text message at ?1.50 (offer is time limited but at least into October)
http://www.babble.net/portal/store/store.php
and, er, Vonage will be following any moment soon, well next month
http://www.stuffmagazine.co.uk/hotstuffart....asp?de_id=2287