This would be an issue for Stop Forum Spam support. UBB.threads fetches a live request for every login to their database, if it finds a value it'll return it to the login page of UBB.threads; we cache nothing.
AFAIK AT&T Wireless provides a dynamic (ever changing) IP address; a user likely did something that got them added to the database, and it just cycles through. IIRC the removal procedure requires you to be connecting from the offending address.
FYI this is common for VPN users who hide behind servers; my own VPN (IPVanish) is often times present in their database.
