Thumb Score: +146 T-Mobile.com is offering their T-Mobile One Unlimited Plan: 2-Lines for $60/month (taxes + fees included) w/ AutoPay valid for Customers Ages 55+. Thanks EragornNote, valid for qualified customers. Proof of age is required. To receive this offer, new customers can sign up at local T-Mobile store with government-issued ID. Existing customers can sign up by calling 1-866-437-9418 or at a local T-Mobile store.