If you have two phones, you can use this app to view your other phone's messages after you have paired the two by scanning a QR Code.

Usage:
Text on your device by pairing your phone

Follow The Steps Below:
1.On your phone, open Messages by Google
2.Tap More options From your conversation list and select Device pairing
3.Tap QR code scanner and scan the code on this device

After a few seconds, you'll be able to access your other phone's messages.

Note: Please Make Sure That Both Devices Have An Active Internet Access.