As loyal Apple Inc. fans upgrade to the newest iPhone 6, beware of potential security faux pas, as data may linger on an old phone unless it has been affirmatively removed.

Corporate data is removed from an old device during the upgrade process, said Scott Christensen, director of technology and information security at Edwards Wildman Palmer. Although the process is not the same as a full wipe, which is done when a mobile device has been lost, the effect is similar.