 Many U.S. carriers such as Verizon, AT&T, and T-Mobile offer free roaming in Mexico and it is possible to connect to U.S. based cell phone towers in many northern parts of the city.Cell phones also have historic usage in Tijuana as the first cellular call in Mexico was made in Tijuana in 1989.Tijuana is a major gateway to the interior of Mexico to which it is connected by air and road directly, and by sea via the ports of Ensenada and San Diego.