how can i make a wifi to blutetooth stealth calling device?

i want to make a device that receives calls via wifi ..

then sends the audio to a bluetooth headphone ... using arduino and similar devices ...

something similar to this

the disadvantage of the device above that it uses cell phone network ( mobile telecommunications ) that is not good all the times at some areas and this what i don't want at all !! i am a beginner and need to know all the components and devices needed to make the stealth calling

"the purpose of the device as simple as...
1- someone calls my device
2- the device receives the call and answers it automatically
3- the device transfers the voice to the bluetooth earphones ...and transfers my voice to the calling device

the purpose of this device is making calls without the need of SIM and without using a smartphone at the receiving side ...

maybe using something like this Facebook Chat With ESP8266 | IOT Project | Rete IOT - YouTube
but voice chat + the bluetooth earphone part

every reply is appreciated

I seriously doubt an Arduino is even remotely up to a job like that.

wvmarle:
I seriously doubt an Arduino is even remotely up to a job like that.

So what do you think that can be remotely up to this ?

mooooon:
So what do you think that can be remotely up to this ?

A small tablet with WiFi running WhatsApp?

cedarlakeinstruments:
A small tablet with WiFi running WhatsApp?

yes but more likely to be at the size of this master card !!