If you're a student or teacher looking to expand your horizons in foreign lands this coming semester, the last thing you need is an astronomical phone bill thanks to those nasty roaming charges. AT&T aims to lend a helping hand with a new international roaming plan designed exclusively for those participating in study abroad programs. Launching August 9th, the plan consists of two packages -- the $60 a month option includes 250 minutes, 250 outgoing messages and 250MB of data, while the $90 option gives you 400 minutes, 400 outgoing messages and 40