Cellular speaker not working properly and has the low sound pitch

Hey there gouransh,

To clarify, are you referring to the physical speaker on your iPhone or your receiver (the place you hold to your ear when on a call)?

If there's an issue with the actual speaker, try the steps found below:

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.

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

Should the issue persist, Contact Apple Support for additional help.

Take care!