Four out of five iPhone users have enabled a feature that allows them to locate, lock and wipe their phones if they are lost or stolen, according to the results of a survey by the San Francisco district attorney's office.The survey was conducted over the first two weeks of November as part of District Attorney George Gascón's push to get smartphone makers to address the rising problem of smartphone theft in major U.S. cities.It was advertised by the district attorney's office through social media and attracted 347 responses. While the survey lacks a wide sample base and is skewed towards social-media users, it found 245 of 313 respondents -- 78 percent -- had Apple's Find my iPhone with an activation-lock feature enabled on their phones.The software lets iPhone users see the location of their phone on a map, lock the phone and remotely erase personal data. A new version supplied with Apple's iOS 7 operating system includes an activa
