Which US networks are Closed or Open for Internet?

Posted by rayand
I work for a content provider that is seeing a lot of mobile phone traffic to our WAP site (bango.net) from the USA, but we get conflicting reports about which operators do or don't bar access to specific internet sites, bar downloads of larger files - e.g. ringtones and pictures, and which generally block all internet traffic.

I'd welcome any observations from users of teh following networks: Cingular, T-Mobile, Sprint, Verizon, AT&T-W, ... etc.

Posted by richy240
On T-Mobile USA I have seen no limits except on ports. That is, we're only allowed WWW, POP3, SMTP, SSL and IMAP. Maybe one or two more, but I'm not positive. But aside from that, I've never had problems downloading large files, ringtones, pictures or even movies (less than 3mb). I've never tried anything too large.

There is, however, an internet plan that allows all ports over GPRS as well.