Iphone 12 promax I cannot hear caller unless on speaker

Hey there, chambushah!

Thanks so much for using Apple Support Communities.

If you're not able to hear your callers while using the built-in receiver, you may want to try working through the steps in this article: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

1. Remove all screen protectors, films, or cases from your device. 

2. Check the speaker opening to see if it's blocked or dirty. On iPhone only, make sure that the receiver isn't blocked or dirty. 

3. If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.

4. Go to Settings > Sounds (or Settings > Sounds & Haptics), and drag the Ringer and Alerts slider back and forth a few times. If you don't hear any sound, or if your speaker button on the Ringer and Alerts slider is dimmed, your speaker might need service.

5. If you hear sound, try making a call with your iPhone and turn on speakerphone. On iPad or iPod touch, make a FaceTime call. If you still can't hear, or hear static or crackling, then your network or reception could be the issue. Try to call again later, or from a different location.

After you've worked through that info, if you're still not having any luck, then you may want to reach out to Apple directly to work on some additional troubleshooting steps and to see if a hardware inspection is available in your region.

We hope that this information is helpful.

​Have a great day!