att.net/speedtiers a tech-support page AT&T only claims 12 to 20 Mbps www.att.net... AT&T https://att.net/speedtiers AT&T - Speed Tiers att.net/speedtiers aquí "AT&T – Speed Tiers" www.att.net... "AT&T – Speed Tiers" http://www.att.net/speedtiers http://www.att.net/speedtiers www.att.net... AT&T - Speed Tiers AT&T only claims 12 to 20 Mbps http://www.att.net/speedtiers