Usually, most users think that using Volume buttons controls the ringer volume of the iPhone; in reality, it is not valid. Instead, they control the System Volume of any Apple iPhone with Volume buttons. Unfortunately, due to this unknown change, sometimes we missed essential calls. This change was made with the latest iOS version.
So, to turn up the ringer volume in iPhone 15 Pro Max and Earlier iPhones, you have to follow few steps mentioned below, and then only you can turn up the ringer volume in reality.
Alternatively, you can find and set boosted sound ring on your iPhone using these free apps to download the iPhone ringtone free.
First Three Quick fix,
#1 Fix Turn off Silent mode
iPhone 15 Users can Use the Action button to mute & unmute the Ringtone (Hold on until you feel Haptic). If the silent switch is customized, then the easy way to Turn off the SLient mode from the control center. Earlier iPhone users could use Silent Switch on the left edge of their iPhone.

#2 FixTurn Off Do Not Disturb Mode
To Quickly Turn off Do Not Disturb, Open the control center on your iPhone > Tap on the Do Not Disturb Button and Disable it. Or Turn off Scheduled Do Not Disturb if enabled under the settings. Launch the Settings app > Focus > Do Not Disturb > Schedules > Disable the toggle.

#3 Turn off Attention-aware Features
The iPhone will check for attention before getting a slower ringer volume. When locked. These settings lower the volume of Some alerts as well. Follow the below steps to stop slowing down the Ringtone Volume at all times.
Step 1: Launch the Settings app on your iPhone > Scroll and tap on FaceID & Passcode. Enter your iPhone passcode to change the settings.
Step 2: Next, Disable the toggle ‘Attention Aware Features‘. That’s it.

We Define what to do?
iPhone ringtone is silent or plays too low.
1. Launch “Settings” app. Select “Sounds & Haptics”.
3. Lastly, drag the Volume slider to the right side under the Ringer & Alerts section and turn up Ringer on the iPhone.

However, in some situations, if you want to lower the ringer in iPhone, then follow the same above steps and drag the slider towards the left.
How to adjust ringer volume in iPhone 15 Pro Max with volume buttons
Alternatively, there is one more quick way to increase ringer/ringtone volume on iPhone 14 Pro Max. That is, you can also control the ringer volume using the Volume buttons. But only if you enable the Change with Buttons can you manage the ringer volume only when your iPhone is not playing any audio, and the Volume button will control the System Audio.
To set your Volume buttons to control your iPhone 14 Pro Max ringer, then follow the steps,
1. Launch “Settings” app from the iPhone.
2.Tap on scroll the “Sounds & Haptics”.
3. Enable toggle on the “Change with Buttons”.

From now on, you can control the ringer volume on your iPhone right from the Volume buttons only if any other audio is not playing on your device.
A ringtone is turned off or not playing
Check the side mute/unmute switch; if the orange mark on the switch appears, that means your iPhone is silent, and the switch is ON position.
Keep it off to get a ringtone sound for incoming ringtone calls or message alerts.
If you have a big issue, you can restore your device to factory settings or get free help from Apple service nearby. Book an appointment to fix hardware or software problems you can’t figure out.
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we are having problem in the ringer sound is very muted
Me too!