have roaming agreements in locations that use GPRS, EDGE, and UMTS/HSDPA cellular technology. Roaming Telcel offers international roaming services to subscribers as well as pre-paid users. Telcel has entered into approximately 385 such agreements covering GSM and TDMA D-AMPS networks around the world. Telcel offers international roaming services including special rates to subscribers roaming in the U.S. border, the U.S., Canada and other markets. Marketing Telcel has consistently engaged in marketing and promotion efforts and customer service. Telcel sponsors professional sporting events, including the Abierto Mexicano TELCEL tennis event, golf tournaments, soccer, and other events in Mexico. They also sponsor a Formula One driver, Sergio Perez, along with sister companies Claro and Telmex. Sales and distribution Telcel markets its wireless services primarily through exclusive distributors located throughout Mexico. As of March 31, 2007, Telcel had relationships with a network of approximately 1,171 exclusive distributors, who sell Telcel's services and products through approximately 48,320 points of sale and receive commissions. Telcel also distributes prepaid cards and handsets, the latter as part of the Telcel Amigo Kit consisting of handsets and free airtime, through distributors that include Telmex, Sears, Sanborns and its network of retail outlets. It is estimated that, as of March 31, 2007, prepaid cards are available through approximately 150,000 points of sale in Mexico. Customer service Approximately 55% of Telcel's employees are dedicated to customer service. Network 3G Technology Telcel officially launched its 3G (850MHz Band) services on February 25, 2008 initially in the cities of: Guadalajara, Hermosillo, Mérida, León, Morelia, Monterrey, Tijuana, Puebla, Santiago de Querétaro and México D.F. This was the second 3G Wireless Network, in Mexico after Iusacell's 3G Nationwide CDMA2000 network. Telcel's 3G Network expanded to other cities, to finally become a national 3G network which reaches more than 350 cities. Telcel's 3G network is based on UMTS / HSDPA / HSPA+ technology (850Mhz/Band V). Telcel launched its HSPA+ network in Mexico City and other major Mexican cities, by the end of 2011. By May 2012, Telcel's HSPA+ network already covered most of the cities and roads in Mexico, offering its customers speeds of up to 7.2Mbit/s. Unlike many companies, who advertise their HSPA+ network as a "4G network," Telcel advertises its HSPA+ Network as a "3.5G network,". As it counts with a 4G LTE Network, which is the one they advertise as "4G" 4G Technology Telcel is the second company in Latin America to