T-Mobile is offering their postpaid mobile customers a FREE $300 Virtual Prepaid Mastercard when they signup for T-Mobile High Speed 5G Home Internet for only $35/Month (regularly $50) with AutoPay for a limited time. You must be a new or existing home or business T-Mobile customer with an eligible plan to qualify for this offer. To qualify for the $300 virtual Prepaid Mastercard you must maintain active service for at least 60 days and register code on on this website within 30 days of activating qualifying new Home Internet line. Allow up to 10 weeks for prepaid card delivery.