AT&T in an FCC commentary submission has asked the government agency to drop its requirements that it and other phone carriers must offer analog landline service. The carrier points to the sharp drop in landline use, including revenue, and that a full 80 percent of American homes use cellphones or Internet calling either alongside analog landlines or even exclusively. Only the remaining 20 percent uses just a conventional phone line and is likely to see its share shrink in the future, AT&T says.