Ahh, it seems some users on wikipedia decided a list of user-agents was not wiki material. You can make a list of sub-genres of sub-genres of some obscure music genre, or make a list of albums for every unknown/unheard of artist in the world. But you cannot keep a comprehensive list of mobile user-agents.http://en.wikipedia.org/wiki/Wikipedia:Articles_for_deletion/List_of_user_agents_for_mobile_phones
Mobile first. Building responsively this way solves half your problems already.