HeyTell, a popular cross-platform voice messaging service, has released an app for Windows Phone. HeyTell allows one to send and receive voice recorded messages, which can prove more efficient than standard SMS. The service requires no account to be created, just add an email and/or phone number and you're good to go.
Some highlighted features:
- Send/Receive messages to and from contacts on Android and iOS.
- Low data usage.
- Toast notifications.
- Messages can be saved and played offline.
- Send/Receive current GPS location.
You can download HeyTell from the Marketplace for free. Note you may occur charges from your carrier from usage.