A cell phone plan is an agreement between you and a mobile carrier that allows you to use your cell phone for calls, texts, and internet access. These plans usually come with a monthly fee and can vary in terms of data limits, call minutes, and text messages. Some plans offer unlimited data, while others have a set amount you can use each month. Choosing the right cell phone plan depends on your needs. If you frequently use your phone for streaming videos or social media, an unlimited data plan might be best. For light users, a basic plan with fewer features could save you money.