Yes, it’s that simple, Xfinity Mobile By-the-Gig data plans start at $15 per month, and they offer unlimited data plans for a single line starting at a monthly price of $45 for one line, the lowest entry price for 5G unlimited data on the market today. All the way up to four lines of 5G Unlimited — at only $30 per line — Xfinity Mobile plans rival any of the “Big Three.” Check out Xfinity Mobile’s savings calculator where you can easily determine how much you could save by switching to Xfinity Mobile.  Xfinity Internet required. Reduced speeds after 20 GB of usage/line. Actual savings vary and are not guaranteed. Taxes & fees extra.