In addition to unveiling three new Windows Phone Mango devices today, AT&T announced that it will offer a new $25-per-month GoPhone prepaid plan.
The plan includes 250 nationwide voice minutes and unlimited nationwide messaging every 30 days, and launches on September 18. On that day, the carrier will also offer GoPhone customers a new international long-distance calling feature that gives 250 minutes of international calls to more than 50 countries for an additional $10 per month.