Yes, you can merge all duplicate contacts in your Android phone's Contacts app: 1. Open the Contacts app on your Android device. 2. Tap the Menu icon (usually represented by three horizontal bars) in the top left corner. 3. Tap on "Merge & Correct." 4. Tap "Merge duplicates." If you don't see this option, it means that you don't have any contacts that can be combined. 5. To accept a duplicate contact suggestion, tap "Merge." To accept all duplicate contact suggestions, go to the bottom of the screen and tap "Merge all."