My iPhone ringer won't stop ringing

Hello, and thank you for using Apple Support Communities.

Does pushing the side button silence the ringer? Answer or decline incoming calls on iPhone

"Silence a call

Press the side button or Sleep/Wake button (depending on your model) or either volume button.

You can still answer a silenced call until it goes to voicemail.

Decline a call and send it directly to voicemail

Do one of the following:

• Press the side button or Sleep/Wake button (depending on your model) twice quickly.
• Tap .
• Swipe up on the call banner.

You can also swipe down on the call banner for more options.

Do any of the following:

• Tap Remind Me, then choose when you want a reminder to return the call.
• Tap Message, then choose a default reply or tap Custom.
• To create your own default replies, go to Settings  > Phone > Respond with Text, then tap any default message and replace it with your own text.

Note: In some countries or regions, declined calls are disconnected without being sent to voicemail."

For the sound issue, try these steps: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker

Try also restarting your iPhone. Sometimes a restart can help resolve issues: Restart your iPhone

Best regards.