My friend with a vision phone (but no Vision plan), who has signed up for text messaging, is receiving unlimited notifications and 1 way text messages. He only incurrs charges when he receives a 2 way notification and then uses his handset to log into Vision to read it (per Kb usage).

For my other friend with a non vision phone who signed up for text messaging through the site, he is getting 60 1 way messages per month at n/c.