I love my N5 - but I have no cell coverage at home
After much research, I have found a great solution...just today.
VOIP service from VIBER!
no new phone number
no usernames or logons
free Viber-to-Viber calls including international
Viber-to-non Viber calls at $.019 - prepay credit minutes
Nice Viber android app - with it's own keyboard
Uses cell phone address book
2 million downloads - high ratings
I have it on my Nexus 5 and my Wi-Fi only tablet!