Plus: T-Mobile shares advance 1.1% and Verizon shares climb 0.8% on a WSJ report that the companies are in talks to carve up U.S. Cellular. The average 30-year mortgage rate fell to its lowest level since mid-April. J.R. Whalen reports.\n\n\n\nSign up for the WSJ's free What's News newsletter.\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices