Its Marcus Lundqvist again, but this time he is showing the video demo of WhatsApp on Jolla. He experienced several problems like
1. You cannot start a new conversation but according to Marcus can send messages only to those of my friend who have send me first something
2. You cannot view your contacts.
Watch the video below:
The Jolla Blog 
Well that is to be suspected, probably the android apps run in some kind of sandboxed environment. There is a native whatsapp for meego named persecute that should work better.
What does Jolla recomend: using Whazzap from meego, leaving whatsapp, wait until it may be fixed, or using as it goes now?
thaks!
Please go to this link https://thejollablog.wordpress.com/2013/12/27/mitakuuluu-native-whatsapp-client-now-available-for-sailfish-os/