Note: If you have signed up for your account after 24 April 2023, please visit the following article: Making and Receiving Calls on the Phone Widget
To make an incoming phone call ring on both speakers and headphones:
Go to Settings > Phone Settings. Navigate to any Phone Settings page, for example, Call Flows or Phone Numbers.
Click on your profile icon in the top right corner of the page and click on Profile Settings.
Toggle the "Ring on speakers and headphones" option.
Click Save.