This release:
• Thanks for using Google Voice. Some issues were resolved behind the scenes and a little polish was added.
Previous release:

• Stability and performance improvements.

Google Voice gives you a phone number for calling, text messaging, and voicemail. It works on smartphones and computers, and syncs across your devices so you can use the app in the office, at home, or on the go.
NOTE: Google Voice only works for personal Google Accounts in the US and G Suite accounts in select markets. Text messaging is not supported in all markets.

You’re in control
Get spam filtered automatically and block numbers you don't want to hear from. Manage your time with personalized settings for forwarding calls, text messages, and voicemail.
Backed up and searchable
Calls, text messages, and voicemails are stored and backed up to make it easy for you to search your history.
Manage messages across devices
Send and receive individual and group SMS messages from all your devices.
Your voicemail, transcribed
Google Voice provides advanced voicemail transcriptions that you can read in the app and/or have sent to your email.
Save on international calling
Make international calls at competitive rates without paying extra for international minutes with your mobile carrier.
Keep in mind:
• Google Voice is currently only available in the US. Google Voice for G Suite users is available in select countries. Check with your administrator for access.
• Calls made using Google Voice for Android can be placed through a Google Voice access number. All access number based calls use the standard minutes from your cell phone plan and may incur costs (e.g. when traveling internationally).