Motorola has dropped to third place behind Samsung in the worldwide mobile phone market because of inventory issues and an unremarkable product lineup, Gartner said on Tuesday. Motorola accounted for 13 percent of the phones sold to end users in the third quarter, down from 21 percent in the same quarter last year, Gartner said. At the same time, Samsung increased its share to 15 percent, while Nokia extended its lead at the top of the pack, accounting for 38 percent of the market, or more than one in every three mobile phones sold.