WhatsApp updates Android app with "Mark as Unread", other features

Whatsapp has updated Its Android app, and has delivered a few additions to its already versatile instant messaging service. 

The new 2.12.194 update brings the "Mark as Unread" option, which allows you to mark a chat you've aleady visited as unread, providing you with a handy reminder if you want to deal with a conversation later. You can now also customise notifications for each contact with a different ring tone, and decide whether or not it generates a popup. A third change is the "Low data usage" mode, where you can monitor your data usage through WhatsApp, and limit it to a particular data count. 

This update is still in beta, so you can only download it from the WhatsApp website.