Verizon Wireless will no longer be allowing customers on a grandfathered unlimited data plan to upgrade to a 4G LTE smartphone without changing plans when the carrier launches its tiered data share plans in mid-summer. Executive Vice President and CFO Fran Shammo announced the news during an investors conference this morning. "LTE is our anchor point for data share, so as you come through an upgrade cycle and you upgrade in the future, you will have to go onto the data share plan, moving away from the unlimited world," he said. "So when you think about our 3G base — a lot of our 3G base is unlimited — as they start to migrate into 4G, they will have to come off of unlimited and go into the data share plan, and that's beneficial for us for many reasons, obviously."