|Oneplus One smartphone.|
Step 1 (Setting -> Privacy): Go to your phone Settings and scroll down to Privacy option. Select Privacy
Step 3 (Show built-in apps): in the right top corner select three vertical dots that will open an additional pop-up menu. Make sure that Show built-in apps is checked in (selected).
Please, let me know if it worked on your phone. If did not work, then provide phone maker, model, android version, build and detailed description of the issues. Thank You!