Is there a prompt you dial to see how many texts you sent? I didn't get the unlimited because they used to charge me 4 bux for unlimited text and now it's 20 bux or something. It turned me off. but i've been sending a lot
I signed up for the 1500 bucket for $10/month. Seems like a decent trade; that works out to about 50 messages per day, which is more than sufficient for my needs.
There is an easy way to figure out your voice and data usage; just log into your att account (www.wireless.att.com -- you can even do it from safari on your iphone -- there's a bookmark at the bottom) and click on data in the "voice and data usage" section.