Limited time offer; subject to change. Qualifying device, credit, service, and port-in (Verizon, AT&T, Spectrum, Claro, Xfinity, Liberty, or US Cellular) required. You must unlock device before port-out; ask us how. Device balance (incl. lease purchase option) up to $800 paid by virtual prepaid MasterCard (no cash access & expires in 6 months) which you can use online or in-store via accepted mobile payment apps, typically within 15 days. Tax excluded. Submit proof of balance & 90+ days in good standing with carrier & device within 30 days of port-in and be active and in good standing when processed; allow up to 15 days. Devices previously used for Keep & Switch are not eligible. We might ask for more information. Up to 4 lines. One offer per subscriber. T‑Mobile Prepaid MasterCard is rebate/reimbursement or exchange on port-in; for any tax implications, consult a tax advisor. No money has been paid by you for the card. Card is issued by Sunrise Banks N.A., Member FDIC, pursuant to a license from Mastercard International Incorporated. Mastercard is a registered trademark of Mastercard International Incorporated. Use of this card constitutes acceptance of the terms and conditions stated in the Cardholder Agreement. , Learn about AT&T's best unlimited data plans, 5G phone plans and other wireless plans. For a limited time, get $200 off when you add a new phone line. Online only., These are the best cell phone plans to cover all your streaming, texting, and posting needs. We highlight the top picks whether you need unlimited data, excellent coverage, hotspot support, a family plan, or a deal when you sign up..