Cox raised the monthly data-usage limits on most broadband services nationwide, a rep said. According to its Website, the new monthly data caps include the 50 GB, 100 GB, 250 GB and 300 GB. The Ultimate cap remains 400GB. In addition, the op is increasing speeds for its most popular Cox High Speed Internet tiers, tripling speeds on the top tier. The increases already occurred in Las Vegas and Phoenix, with more markets to follow throughout the year.