LOS ANGELES – Starting Wednesday, seven-digit dialing will be a thing of the past for a broad swath of coastal Los Angeles County. Residents of such posh enclaves as Santa Monica, Malibu and Brentwood will be among the first Californians to be required to dial 11 digits each time they pick up the phone, even if they are calling a next-door neighbor. The change comes as part of the state's first-ever area code overlay, in which future phone numbers within a region receive a new area code while existing numbers keep the old one. It contrasts with the more common...