Three is NO free lunch. It looks like once these folks set the hook.. the free stuff disappears little by little.. and suddenly... OMG!
Yup, they will increase price. A friend in CA got a similar service...data only for $5/month a couple of years ago. IIRC a gig/month and kinda slow but for back up service he liked it. The last I heard it was up to $10/month but he still liked it. Not available here though.