Cell phone plans are agreements between customers and service providers that outline the terms for using mobile phone services. These plans typically include features such as voice calls, text messaging, and data usage. Customers can choose from various options, including prepaid plans, where they pay in advance, or postpaid plans, where they receive a bill at the end of the month. Different providers, like Verizon, AT&T, and T-Mobile, offer a range of plans to suit individual needs. Factors to consider when selecting a plan include coverage area, monthly costs, data limits, and any additional features, such as international calling or family sharing options.