There are free phone numbers available that don’t come with a monthly bill. Typically, you only get a phone number if you pay for a landline, activate a mobile phone or SIM card, or sign up for a VoIP service. This article explains how to get a free phone number and what features are available.
How to Get FREE Phone Number – Free Virtual Phone Number for Verification
Google Voice gives you a toll-free phone number that can ring multiple devices at once for incoming calls. That means when people call your toll-free Google number, it can ring your computer, phone, and tablet to make sure you don’t miss the call.
An additional (and useful!) feature you get with Google Voice is transcribed conversations. This means you can read your voicemail instead of listening to it. You can also forward your "real" phone number to the Google Voice service.
Google Voice lets you make free local calls within the U.S. to any phone number, including business phones, other cell phones, and landlines. International calls are also available, but cost extra.