After install the Google Voice App for your Android device, and you may received this Error.
Your phone number could not be verified. Please try again.
Because you haven’t add your mobile number for the Google Voice.
To add mobile number for the Google Voice , could be found in here.
- Open the website from your browser https://www.google.com/voice
- Click on Get a Voice number.
- Click on I want to use my mobile number button.
- Enter your mobile number and check for available option.
You can read the Google support for the information.
We only support Google voicemail with your AT&T, Sprint, T-Mobile, and Verizon mobile phone numbers.