No Sound

Hi Cynzroom.

Welcome to the Apple Community.

Wondering if you can hear other sounds ok, like Voice memos, videos etc.

You could try restarting your iPhone, which sometimes restores normality.

Restart your iPhone - Apple Support

Also check settings : Settings > Sound

Also check : "Do Not Disturb" is not on

Use Do Not Disturb with Focus on your iPhone or iPad - Apple Support

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You might want to try updating to a newer iOS to see if that makes a difference

eg: iOS 15.5 is compatible with iPhone 6s Plus (but iOS 16 is not compatible)

iPhone models compatible with iOS 15.5 – Apple Support

To update your iPhone to the latest iOS software compatible with your model, go to Settings  > General > Software 

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Re: no longer sounds or alerts for new incoming texts, emails, voicemail or incoming calls.

Apple Support have a few articles online that may help troubleshoot:

Guess you would have checked the volume is turned uo to a comfortable level, and that "mute" is not on.

While on a call on iPhone – Apple Support

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

Also check notification settings : Use notifications on your iPhone or iPad - Apple Support

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If you have these settings: Adjust the mono audio, balance, and phone noise cancellation settings on iPhone – Apple Support

Check settings : Change iPhone sounds and vibrations – Apple Support

If nothing here has helped:

You might want to:

✽ Talk to an Advisor by calling the Apple Support number for your country or region.

Apple phone numbers around the world

Contact Apple for support and service - Apple Support

✽ Use online chat or phone:

Official Apple Support

or

✽ Use the Apple Support app to find answers, talk to an expert or make a repair reservation.

https://apps.apple.com/au/app/apple-support/id1130498044?l=en

All the best :-)