Sharon,

It's important to distinguish between AT&T Wifi "Basic" and "Premier". Have a look at the AT&T Wifi page. As an AT&T customer, I also get Basic for free and it isn't all that useful. However, AT&T customers can buy Premier for $10 a month; it has domestic + int'l + roaming coverage. For me, Premier is better than Boingo Limited ($10/month). For international, I've had surprisingly good luck with Premier, but I think Boingo Global ($60/ month) is better.