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just get a smart watch. i use my gear s3 all the time like you suggested. i never have to take my phone out. i can make and receive calls as well as texts messages.Well, The idea is that you can keep your large Phablet phone in your backpack say, whilst using a smaller device to make and receive calls. The smaller device is connected by bluetooth to the larger device (in my case the Mate 20X).The larger device actually makes or receives the calls which are transmitted over bluetooth to the smaller device.
Here's some explanation https://archive.eetindia.co.in/www.eetindia.co.in/ART_8800694575_1800005_NT_8c1667f8.HTM
Imagine a bluetooth headset but with the ability to dial numbers.
Bearing in mind that I disable Google Assistant immediately upon buying a new phone, and have never touched a bluetooth headset: why can't this be done with 'okay, Google, call Joe Blow [or 123-4567]'?Well, The idea is that you can keep your large Phablet phone in your backpack say, whilst using a smaller device to make and receive calls.