A trial phone is a device that allows someone to test out or try out a new mobile phone service, usually for free or at a discounted rate. The term typically refers to a limited-time offer from a cellular provider where customers can use a particular model of phone for a certain period (usually 30 days) without committing to an extended contract. During this time, the customer can experience the service and decide whether or not they want to continue using that carrier long term. The trial phone is often used as a marketing tool by cellular providers to attract new customers and retain existing ones.