By default, the quantity buttons on the aspect change the “system quantity”, which impacts issues like music and video playback. However the quantity of your ringer quantity, which controls the ringer and notifications, stays the identical until you modify it from the settings.
If you need your quantity buttons to management system quantity and ringer quantity, you may make them accomplish that by tweaking one setting. Open your iPhone’s Settings app and faucet on Sounds and Haptics.
Beneath Ringers and Alerts, toggle the swap that claims Change With Buttons.
Now whenever you press the quantity buttons, it’s going to additionally change the quantity of the ringer.