By far, one of the favorite apps of the team at iOSolutions4u is Voxer. This app turns your iPhone or iPad into a Walkie-Talkie. There is a "push-to-talk" button that records your voice and sends it to an individual or group of your choosing. This is handy for situations where a quick message is all that is needed, and a phone call is not practical.
Believe it or not, the app is actually FREE. That is right, it costs nothing. You can even use it to send text messages or photos.
The coolest feature is that your contacts do not even need to be online or available for you to send them a message. They will simply be notified on their iOS device and can choose to listen to the message at their convenience.
Have you tried Voxer yet? Let us know about your Voxer experiences!
Here is the link to the page in the App Store