This app was mentioned in 14 comments, with an average of 31.93 upvotes
https://play.google.com/store/apps/details?id=com.rebelvox.voxer
Voxer walkie talkie messenger.
I'm pretty sure they are legally obligated to maintain a minimum number of bugs in their app because each time they fix one they break something else...
Try voxer, it's great for communicating with your SO and it works on the web, when you're at your desk. I just log into it with facebook so I don't have to remember a separate username/password.
I don't hate Hangouts but this would be my list of stuff to improve the app since it could be the best messaging app in the App Store
Voxer doesn't meet OP question. It is BETWEEN 2 phones. OP wants 1 phone 1 connected device.
https://play.google.com/store/apps/details?id=com.rebelvox.voxer
My husband uses Voxer. It does store the messages, but it also plays live if you have the app open.
Brings me back to my Voxer days
https://play.google.com/store/apps/details?id=com.rebelvox.voxer&hl=en\_US&gl=US
Voxer (3.18.20.21535) https://play.google.com/store/apps/details?id=com.rebelvox.voxer
Voxer (3.18.19.21403) https://play.google.com/store/apps/details?id=com.rebelvox.voxer
I searched for "walkie talkie" and think it is what you're looking for. Just find the one that fits best. This is the first hit: https://play.google.com/store/apps/details?id=com.rebelvox.voxer
Not sure if this is helpful, but have you considered a voice messaging app like Voxer?
That's why we have stuff like Voxer. Basically its text-message style but with voice mails instead. Convenience of text messages, but still getting the person's voice.