A Postpaid SIM Card is a type of mobile phone plan where users pay for their services at the end of each billing cycle. This means that customers receive a monthly bill that includes charges for calls, texts, and data usage. Postpaid plans often come with a fixed monthly fee, which can include a set amount of data and unlimited calls or texts. These plans are typically associated with contracts that last for a specific period, often 12 or 24 months. Users may benefit from additional perks, such as discounted devices or priority customer service. Popular providers of postpaid services include major telecom companies like Verizon, AT&T, and T-Mobile.