The app - Heard - achieves this seemingly impossible feat by constantly recording whatever is going on and keeps it in a state of buffering.
If the user then decides he wants to record something that has already happened, he can go into the app and do exactly that, The Sun reported.
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The app also syncs with social networks so audio clips can be easily uploaded onto facebook, or emailed to pals.
It can run constantly whenever the smartphone is turned on, but it does have a red banner at the top of the phone screen to remind the user it is still on.
Heard is available free with 12 seconds' recording time, or for $1.99 for up to 5 minutes in the Apple store.
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