Timely thread for me... I have been on the 'other' $30 plan for more than a year. the one with 1500 minutes/messages and 30mb data. would you believe I never hit the limit even once on the data side? To me it was an easy mental discipline to understand that Data on the 'droid is for emergencies - like on a road trip, need to pull a map and can't wait to hit a mcdonald's or burger king or free wifi [in texas along some of the heavily traveled interstates there are a lot of wifi free spots]. see what I mean? I just don't need big downloads until I'm in a spot to sit down and jump on wifi.
so, I JUST today switched to the "unlimited" data plan, where I'll have to treat voice calls as "must" only. mainly [and this is a business line for me - i consult] its incoming use only. if someone calls to inquire about an appt or something I talk. otherwise, I don't do much chit chat on the handset.
The thing not mentioned above that needs to be mentioned: on the Prepaid plans, if you hit the wall, just refill. its that simple. think about it as not $30 per month but $30 per tank. If I hit the wall at three weeks, so be it. on a yearly basis it will still work out to be a huge savings.
also, nobody mentioned the use of google voice callback.... I had noticed in the last 4 months or so that for reasons I don't understand, I'm able to get Google Voice callback [not Groove IP... never used it] in locations I never did before. if anyone understands the 'why' of this I'm all ears