A Virginia television station is warning customers planning to switch their wireless service to AT&T to think twice.  The company recently announced it was increasing prices on data plans for new customers, although existing ones can keep their current plans.  Virginians considering leaving Sprint, Verizon Wireless, or T-Mobile will find themselves locked into the new, higher prices if they move to AT&T, WTKR in Norfolk reports.  The “grandfathered” service plan, exempted from price hikes and service restrictions, is increasingly becoming a customer retention tool.  (1 minute)

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