How do I make wi-fi calls from a cell phone with no number now associated with it? I recently got tired of paying $65+ a month for cell service when I get mostly email. So I dropped my Sprint service in favor of $20 a month, no-contract phone and a Nexus 7, because WiFi is seemingly everywhere. It works great! I have all the service I need, and it's much cheaper. 

I still have this nice cell phone, a Nexus S. I enabled the WiFi on it. I'd like to make free WiFi calls on it but it no longer has a number associated with it. I ported that number over to my $20 a month phone. Is there anyway I can get a number associated with this old phone so I can sign up for a free voip service?  Is there anyway I can make voip calls without a number?  

Thanks.
It's not possible to have the same number on two different phones.

On your Nexus S, you could install Skype. That will give you FREE VOIP for Skype-to-Skype calls. You don't need a number for this, just an internet connection (and a Skype account, which is free). Take note, however, Skype to mobile / landline is not free.

For other alternatives, search for voip in Google Play.

Edit #1: I looked around and found IPKall. It gives you a FREE Washington number. Is this the kind of service you are looking for?