With El Cap I had incoming phone calls working great on the MacBook Pro 15" Early 2011. Now after the upgrade to Sierra no matter what I try incoming calls don't work. The iPhone 6s Plus is on iOS 10. I've tried these options: Made sure iCloud and Facetime accounts are the same and functioning, toggled these settings for good measure on all devices and tried rebooting both the iPhone 6S Plus and the Mac. All devices are connected to the same Wifi network. Turned off Wifi calling, tried receiving a call. Turned it back on (Enable wifi calling and click the Enable wifi calling on all devices on the phone), tried receiving a call. No luck. I can make outgoing calls to phone numbers using iPhone from the Mac (it doesn't use Wifi calling but uses the iPhone even if Wifi calling is on). With Wifi calling on and with the iPhone 6S Plus in Airplane mode, I can't make calls from the Mac (which pretty much means Wifi calling is off on the Mac). UPDATE: I was able to resolve this, see below for the update. --- Post Merged, Sep 25, 2016 --- Resolved it! Posting the fix in case anyone else faces the same issue. NOTE: This issue may not have been specific to the Sierra or iOS 10 upgrade, but I am posting here since I thought this may have been the case. The following sequence helped with a Sierra Mac and iOS10 phone: Made sure Facetime and iCloud are logged into the same iCloud account on both the phone and the Mac Made sure Wifi calling is on (Settings -> Phone -> Wi-Fi Calling, turn on if your carrier supports it) AND made sure Calls on other devices is also on (Settings -> Phone -> Calls on Other Devices) Made sure both phone and Mac are on the same WiFi network Reset the Network settings on the phone (General -> Reset -> Network settings). Rejoin the same Wifi network that the Mac is connected to. Sign out of iCloud on the phone (Settings -> iCloud, scroll all the way to the bottom, Sign Out) Wait for two minutes Sign into iCloud on the phone After this I was able to test an incoming call just fine. Works perfectly now.