Google Voice is a basic VoIP (Voice over Internet Protocol) service that anyone can use to set up an extra phone number. It's free in the United States for personal use, can route to your Android ...

The Google Voice service gives you a free phone number to use for phone calls, text messages, and voicemail on your mobile phone and your computer.

Several apps can get you a free second number for your phone, whether it's for business or personal communication.