WhatsApp android got 5 new Features

WhatsaApp Messenger v2.12.250 got new features -
1. Mark chat as read/unread.
2. Custom notification.
3. Mute individual contacts
4. Lower data consumption during call option under Setting > Chats and calls > check 'Low data usage'
5. Added new emoji and choose a different color.

web.whatsapp.com FACT

Hope you are aware of whatsapp started web application that can be accessed on Desktop and Laptops as well. http://web.whatsapp.com/
I Started using web.whatsapp.com on my lappy using my WiFi connection and switch OFF my mobile data, web.whatsapp was not working but as soon as I switch ON the mobile data web.whatsapp started working.
So, web.whatsapp is using Mobile Data/Mobile WiFi connection instead of Laptop broadband or Wifi.