Pay anytime by calling #PAY (#729) from your U.S. Cellular phone, which is always a free call, or 1-888-944-9400 from your landline phone. U.S. Cellular can debit your checking or savings account over the phone. We also accept American Express®, Discover®, MasterCard® and Visa®. At a U.S. Cellular Store. Sometimes due dates can sneak up on the best of us. So if you need to pay your bill in person, feel free to bring it to one of our stores.* We enjoy the opportunity to connect with you in person. * Certain Agent Locations cannot accept bill payments.