Currently the market for mobile video seems largely untapped, as consumers have yet to become enamored with existing systems. Forrester Research, a technology and market research firm, found that only 1 to 3 percent of people surveyed in 2006 said they would care to access video on a handheld device. The chief reason is cost. Verizon Wireless subscribers, for example, pay an additional $15 per month for its so-called V Cast service. Moreover, a quality-of-service issue plagues conventional cellular systems because video hogs bandwidth: frame rates drop when too many callers are on at once. This problem has forced cellular providers to build higher-power transmitters and to use additional frequencies.