The Facebook-owned messaging service is reportedly testing the ability to edit or recall messages that have already been sent. This means you can delete or revise a message even after your friend's phone has technically received it.
The feature only works if the recipient has not read the message yet. On WhatsApp, this is signified by a blue tick mark. If the message has simply been received by a phone but not read — with grey tick marks, in other words — the feature still works.
The feature was first spotted by Twitter account @WABetaInfo, which tracks features that WhatsApp is testing across platforms.
