You are on a video call in a kitchen with the extractor fan running, and the person on the other end sounds like they are speaking from the next room. You press the volume button until it stops. It is still not enough.
Calls are the one place an iPhone can feel underpowered, and it is not because the speaker is weak. Call audio is handled separately from music and video, with its own volume and its own limits.
Once you know which volume you are actually adjusting, most of the fix takes about thirty seconds.
Your iPhone keeps several volumes, not one
There is a ringer and alerts level, a media level for music and video, and a call level that exists only while a call is connected. They are stored separately.
That is why turning everything up before a meeting achieves nothing. Raise the volume while music is playing and you raise the media level. The call still opens at whatever the call level was last set to, perhaps halfway down from a call you took in a library.
Turn it up during the call, not before
Press the upper volume button while the call is live and audio is coming through. Watch the on-screen indicator: during a call it shows a phone or call icon rather than a music note, which tells you the right slider is moving.
iOS remembers a separate level for every output
The in-call volume is stored per route: one for the earpiece, one for the loudspeaker, one for wired headphones, one for each Bluetooth device. Turn it up on the earpiece and the speaker stays where it was. So build the habit: after you switch to speaker or connect your AirPods, press volume up again. Most quiet calls come down to a route that never got turned up.
Speaker, earpiece, and the setting that chooses for you
The earpiece at the top of the screen is designed to be quiet, because it sits against your head. The loudspeaker at the bottom is much louder, and tapping the speaker button in FaceTime, WhatsApp, Zoom or Teams is the single biggest change you can make.
If you always want that, go to Settings > Accessibility > Touch > Call Audio Routing and choose Speaker instead of Automatic. Calls then start on the loudspeaker without you reaching for anything, and the same screen can default to a Bluetooth headset.
Bluetooth calls are quieter than Bluetooth music
If your AirPods sound full and loud for music but thin and distant on calls, nothing is broken. Bluetooth uses one mode for playing stereo audio and a different one for two-way calls, and the call mode carries much less information because it has to send your voice in the other direction at the same time.
The result is quieter, narrower sound on calls. Newer devices and codecs have narrowed the gap and details vary by model, but the pattern holds on most gear. If a call matters, wired earbuds or the loudspeaker usually beat wireless.
Accessibility settings that genuinely help
Under Settings > Accessibility > Audio & Visual there is Headphone Accommodations, which can amplify soft sounds and adjust tuning for clearer speech. On supported Apple and Beats headphones it can be applied to phone calls as well as media, using a separate switch, and for a soft-spoken colleague it can do more than volume alone.
On the same screen, models that offer Phone Noise Cancellation have a switch for it. It reduces background noise during earpiece calls, and while it usually helps, some people find speech sounds thinner with it on. It is worth trying both ways.
Mono Audio is also there. If you are using one earbud, switching it on sends both channels to that ear so you stop losing half of the conversation.
What a booster app can and cannot do here
This part is worth being straight about. iOS keeps apps separated from each other, so no third-party app can reach into a live FaceTime, Zoom or WhatsApp call and turn up the other person's voice in real time. Any app claiming to do that is not describing how iOS works.
What an app can do is amplify audio it plays itself, and audio it captures from the microphone. So Volume Booster: Bass & EQ is useful around calls rather than during them. Play a recorded meeting or a voice message through it and you can lift the level well past the stock player, then shape the mid-range where speech sits so quiet talkers become legible.
Its Live Amplifier covers the other half of the problem. In a hybrid meeting where the far end of the table is inaudible, it amplifies the room through your headphones. No help with the person on screen, but plenty with the person across the room.
Things to try before you blame your phone
Often the problem is at the other end: a laptop microphone across a desk, a weak connection, a hand over the phone. Asking someone to move closer to their microphone does more than any setting on your side.
Then reduce your own noise. Move away from fans and traffic, close a door, cup a hand behind the phone's speaker to reflect sound towards you. And check nothing is blocking the speaker grille — a thick case or packed pocket lint takes a surprising amount of level away.
Quick answers
Why is my FaceTime volume so low?
Usually because the call volume for that output was left low, or the call is playing through the earpiece rather than the loudspeaker. Press volume up while the call is running, then tap the speaker button and press volume up again.
Can an app make Zoom or WhatsApp calls louder?
No. iOS does not let one app amplify another app's live call audio, so anything promising that is overstating what it does. Boosters work on media they play themselves and on microphone input, which covers recordings and in-room sound.
How do I make calls louder on AirPods?
Raise the volume while the call is connected, since AirPods keep their own stored call level. Then look at Headphone Accommodations under Accessibility, which can amplify quiet speech and be applied to calls as well as to media.
Why do calls sound quieter than music on the same headphones?
Because Bluetooth handles two-way call audio differently from stereo playback, with less bandwidth to work with. The effect varies by device and codec, but wired headphones or the loudspeaker usually sound louder on a call.
Where to get it
Volume Booster: Bass & EQ is free on the App Store, with a boost dial, a ten-band equaliser and a live microphone amplifier.
Use the iOS settings for the call itself, and the app for the recordings and rooms around it.