I will be in Mexico tomorrow (Monday) through the following Monday... using AT&T service. And here's my "very basic" and perhaps silly question... AT&T is quoting a $24.99 charge for 20MB of data use... and I've no idea how to estimate what I'll get in terms of email reading (text, no attachments) for that amount of data. Is it as simple as looking at the average size of my email and estimating from that?

The "overage reate" is $.005/KB and I for sure don't know how to interpret that.

Any help based on your experience is much appreciated.