There are several different ways to control iPhone volume. The method you use will depend on which type of volume control you wish to adjust. iPhone volume can be adjusted from the settings menu or using the volume shortcut buttons on the side of the iPhone.
To Change iPhone Volume from Settings Menu:
1) Open Settings.
2) While in the Settings menu, find "Sounds". Open the Sounds menu.
3) Using the slide bar, adjust to the desired ringer and alert volume. As soon as you begin to adjust the volume, your ringtone will play so that you can hear the volume level. Once a desired volume is reached, press the home button to return to the home screen.
To Change Volume Using Shortcut Buttons:
To adjust the volume without having to enter the Settings menu, simply use the iPhone volume buttons located on the side of the phone. If you are looking at your phone, the volume shortcut buttons are located along the top left side of the phone. The top button will turn the volume up and the bottom button will turn the volume down.
To Adjust iPhone Call Volume:
The call volume must be adjusted while you are on a call. Use the volume buttons on the left side of the phone to adjust the volume up and down as desired.