How does one receive calls to a virtual phone number on a wi-fi phone (or dual-mode phone)?

additional info related:
"Similar to dual-mode cell phones are Wi-Fi phones. Wi-Fi phones aren't technically cell phones because they only have a Wi-Fi radio, not a cellular radio. Wi-Fi phones look like cell phones (small, lightweight handsets), but can only make calls when connected to a wireless Internet network. That means all Wi-Fi phone calls are VoIP calls.

Wi-Fi phones are useful in large companies and offices with their own extensive wireless networks. And could prove to be the next big thing, with the expanding market for municipal Wi-Fi.
source:https://computer.howstuffworks.com/ip-telephony9.htm

Does the phone allow you to have skype ? (philips had a wifi phone with skype build-in)
then you can take a premium skype and have a land-line assigned to your skype account

Google has a similar option

rleplae 

Does the phone allow you to have skype ? (philips had a wifi phone with skype build-in) then you can take a premium skype and have a land-line assigned to your skype account Google has a similar option

I am planing to buy the phone.
I don't want to go through a third party like skype (mircosoft) or google.
I was planing to buy a phone and an virtual number.

https://computer.howstuffworks.com/ip-telephony9.htm