My phone , when I try to call , the volume seem to be so slow than normal , this happens after I updated my phone , whenever I wear my headscarf I barely hear anything .. Any solution ? Thanks in advance

Hello there, dzharun!

Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue hearing callers on your iPhone. I know how important it is to be sure you are able to hear callers. Restarting the phone and adjusting the audio are great steps! Check out this article for If you can‘t hear a person on a call or voicemail or if the sound isn‘t clear on your iPhone. Since you have tried the restart, check out these steps specifically:

Clear the receiver

The iPhone receiver won't work properly if it's blocked or dirty.

Follow these steps, testing after each:

• Make sure nothing is blocking the receiver, such as a case or film.
  If you have a new iPhone, remove the plastic film on the front and back of the device.
• Check the receiver opening to see if it's blocked or dirty. If necessary, clean the receiver opening with a clean, small, dry, soft-bristled brush.
• While you're on a call, turn on speakerphone. If you still can't hear, then your network or reception could be the issue. Try calling again later or from a different location.

Also, check out this article with links for more help: Get help with hardware features on your iPhone, iPad, and iPod touch. It has links to articles for more steps to help with the issues with the receiver and speaker.

Cheers!