Tap each of the three options (Events’, ‘All-day events’ and ‘Sound’) on the next screen, and ensure they are all set to ‘None’.
Gwasgwch ar bob un o'r tri opsiwn ('Events', 'All-day Events' a 'Sound') ar y sgrin nesaf, a sicrhewch fod 'None' wedi'i ddewis ar gyfer pob un ohonynt.