As you may already know, Google is ending support for XMPP based calling with Google Voice. What this means to you is It simply shuts off access to Google Voice via third-party XMPP clients. Your Google Voice phone number will continue to work just like it does today. The service isn't shutting down, so creating rumors about numbers being canceled or porting refused is preposterous.
Basically my free over the wifi Talkatone is about to end. I’m one of a few hundred thousand customers enjoying free wifi calling through Talkatone. But on May 15th, Google is dropping support for the XMPP protocol that makes this work.
So, what other options you have? Talkatone is asking for you to sign up for a paid subscription phone service. Anything else they are not saying? Yeah, While Google Voice and Hangouts will still offer free calling :)
It seems like Google Voice, free VoIP phone-call, texting, voicemail and voicemail-transcription product will soon merge with the Google+ Hangouts apps on both iOS and Android leading to the complete elimination of Google Voice as a separate service.
I recently tried the Google Hangout iOS app, and it works perfectly for my purpose, just an alternative for my poor 250 minutes AT&T Go-phone service.