the title says everything that needs to be said about the Handsfree Mac
App, pair your Mac using Bluetooth with your phone - Android or IOS it
doesn't matter - and begin using your Mac's audio system as a handsfree
system with the paired phone.
Handsfree App offers quite a bit more than Facetime on the Mac and those
features include SMS send/receive - if you have an Android device -,
call transfer and call recording.
Price of this app is $10.
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Those who don't need help are prepared to help themselves