Competition for 5G customers will be stiff. Comcast this week added 5G service for free for its Xfinity Mobile customers. Comcast and Charter are primarily cable TV/home broadband companies but they've moved aggressively into the mobile space. "Comcast's Xfinity and Charter's Spectrum Mobile reported postpaid wireless net adds in the first quarter that surpassed both AT&T and Verizon's postpaid net adds," according to FierceWireless, which covers the industry.