A wireless carrier is a company that provides mobile communication services to customers. They enable users to make phone calls, send text messages, and access the internet through mobile devices like smartphones and tablets. Wireless carriers operate their own networks, which consist of cell towers and other infrastructure to transmit signals. These companies offer various plans and services, including prepaid and postpaid options, to meet different customer needs. Major wireless carriers in the United States include Verizon, AT&T, and T-Mobile. They often compete on pricing, coverage, and data speeds to attract and retain subscribers.