iPhone 7 (speaker greyed out)

Hello mahad17,

Thanks for using Apple Support Communities! We understand you're having issues hearing and being heard while on calls; let's look into this more.

The following support article provides some troubleshooting steps to try for not being able to hear:

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

For the issue of you not being heard while on calls, this article can help:

If the microphones on your iPhone aren't working - Apple Support

Specifically, try the steps in the section labeled "If people can't hear you on phone or FaceTime calls"

Finally, make sure you have the most up to date software installed on your iPhone. As of this writing, the current version of iOS is version 14.0.1:

Update your iPhone, iPad, or iPod touch - Apple Support

Hope this helps.

Best Regards.