i am unable to hear on facetime calls

Hi mamtav.

welcome to the Apple (user-to-user) Community.

Re: i am unable to hear on facetime calls

If this only occurs in FaceTime:

... wondering if the other person on FaceTime is "muted" so can not be heard.

If so, you can ask them to click the "microphone with a line through" button to unmute.

The pictures in this article show the microphone button in use (without line through)

Use FaceTime with your iPhone or iPad - Apple Support

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If muting is not the cause of your issue, then changing the volume during the call may be necessary: While on a call on iPhone - Apple Support

or you could try other sound settings to see if that helps:

Adjust the volume on iPhone - Apple Support

or

Change FaceTime audio settings on iPhone - Apple Support

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You can use FaceTime over Wi-Fi1 or over cellular on supported iOS devices.

If using wi-fi isn't working well, you could try using cellular (charges may apply),

or vice versa.

or

Apple support's article:

If you can't make or receive a FaceTime call on your iPhone or iPad - Apple Support

says:

"FaceTime and FaceTime audio calling might not be available for all countries, regions, or carriers."

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If needed:

FaceTime support have a website online (link below)

There's a "Get support" link at the bottom

FaceTime - Official Apple Support

All the best :-)