Pantech Co., South Korea's smallest smartphone manufacturer, on Friday raised concerns over a mobile carrier's decision to cut the factory price of its smartphone, saying the two did not have an agreement on the matter. LG Uplus said it will slash the price of Vega Secret Up smartphones by 37 percent to 599,500 won (US$577.92) from the previous 954,800 won, claiming the move is meant to help Pantech expand its sales amid stagnant market conditions.