Sprint today announced a change to the cost of data plans for smartphone users. Starting January 30, customers signing new smartphone contracts will have to pay a $10 per-month Premium Data add-on charge, which Sprint says will allow it to continue to maintain its high level of service. Sprint claims that smartphone users consume 10 times the mobile data of non-smartphone users due to data-intensive apps and services. Sprint argues that its smartphone customers will still receive the "best value" when it comes to overall plan cost. Sprint points out that it offers plenty of devices (including touch phones) that don't require the Premium Data add-on. The plan will be applicable to Blackberry, Android, Windows Mobile, Palm, and the Instinct family of devices. Sprint points out that users of the EVO 4G, Epic 4G, and EVO Shift 4G are already paying this fee.