You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Verizon CEO Hasn't Used an IPhone -- Yet BlackBerry, Droid, Samsung Tablet and IPad Rotate Through Ivan Seidenberg's Briefcase By Matthew Creamer, Published on January 11, 2011 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.