Verizon Wireless subscribers who have held onto their $30-a-month unlimited data plans will soon be forced to upgrade to a new tiered offering the company plans to launch this summer, according to the Web site Fierce Wireless.Speaking at the J.P Morgan Technology Media and Telecom conference today, Verizon Communications CFO Fran Shammo told investors that the company’s 3G unlimited data plans that customers were allowed to hang onto last year when Verizon switched to a tiered offering will soon go away entirely. Read the full story at CNET.