How does calls work with bluetooth

[ags12]

I have never used smartwatch but planning to purchase one.

My doubt is, if galaxy watch is connected to phone, can i still attend calls through phone without disconnecting bluetooth in phones?

Or 

Does it works the same way as phone is conncted to bluetooth headphone in which i need to disconnect bluetooth every time after attending a call in smartphone?

[BeingABHIRAM]

yaa it work
but without phone you need to purchase LTE edition

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