Go to http://voice.google.com

Sign in with personal gmail address

*****dont have one, register for one (it's free)*****

Choose are a phone number by are code follow the instructions to activate

https://www.youtube.com/watch?v=Q6FOQtaOG1E

Download Google voice app in App Store on Iphone or Play store on android

Make the phone calls and send txt messages, using the app.

****This is only optional if you want to use it, this just hides your personal number.