We limit the viewing of threads to five (total) right now to keep the server steady for logged in members. Fight days,
random google searches, and frequent "browsers" can put a heavy load on the server so to ensure the highest quality of service for the members we limit viewing to guests.
I might be misunderstanding your personal situation, but if not- you can be logged in on both you phone and personal computer at the same time. So you wouldn't have to log out on the phone unless it is shared with someone else.