Instructions apply to devices with iOS 14 through iOS 8, and Macs withmacOS Catalinathrough OS X Yosemite.
The best way is to change the controls on your iPhone:
Open theSettingsapp on your iPhone and tapPhone.
TapCalls on Other Devices.
Move theCalls from iPhonetoggle switch to the Off/white position.
ClickPreferencesin the drop-down menu.
Clear theCalls From iPhonecheck box.
Then, scroll down and tapPhone.
In theRingtonesection, move both theSoundandHaptictoggle switches to the Off/white position.
More on Continuity
Incoming calls show up on multiple devices due to a feature called Continuity.
Continuity allows your devices to be aware of and interact with one another.
