This not only streamlines your contact list but also ensures that you have accurate and up-to-date information at your fingertips. Here are some practical ways to automate merging duplicate contacts on your phone. Native tools Use built-in phone features Most smartphones come with built-in features to detect and merge duplicate contacts. Set reminders every few months to review and clean up your contacts using either built-in phone features or third-party apps. Regular maintenance prevents the buildup of duplicate entries over time, keeping your contact list neat and easy to navigate.