Shares of Sprint Corp S were trading lower by more than 10 percent early Monday, while T-Mobile US Inc TMUS's stock was lower by more than 5 percent as merger talks between the two companies halted with no agreement reached. The competitive landscape in the wireless sector going forward will continue pressuring prices as average revenue per user moves lower, KeyBanc Capital Markets' Brandon Nispel said in a Sunday note. Sprint will likely "lead the way," and the company needs to focus on gaining market share — an area where it has been "moderately successful," Nispel said. T-Mobile will continue gaining market share at the expense of larger rivals Verizon Communications Inc. VZ and AT&T Inc. T, the analyst said. Source