Verizon Wireless is working to simplify its approach to prepaid with a new Allset plan that costs $45 a month and includes unlimited voice minutes, unlimited messaging, and 500MB of data. Obviously some smartphone users will need a higher data cap than that, but rather than offer several different plan tiers, Verizon now wants its prepaid customers to add data a la carte. The carrier refers to this as Bridge Data, and as the name implies, one benefit of the new approach is that unused data will roll over from month to month.