Hello Aliharri.
Thanks for reaching out to Apple Support Communities. Let's try the following:
"Remove all screen protectors, films, or cases from your device. Check the speaker opening to see if it's blocked or dirty. On iPhone only, make sure that the receiver is not blocked or dirty. If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.
Check the sound on your device
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. Contact Apple Support for iPhone, iPad, or iPod touch.
Try making a call
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.
FaceTime isn't available in all countries or regions."
If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker
Need more help, Contact Apple for support and service
Cheers.