WhatsApp Client Developed for Ubuntu Phone
The application is called WhosThere and it's in Alpha
The current version is in Alpha, but there few features work already: registering a mobile number with the Whatsapp service, Sending and Receiving Messages (no images, group chat or other fancy stuff), saving credentials and messages on local storage, and a demo mode that you can try without registering.
Installing it on Ubuntu Phone is an entirely different matter, but Matthias has provided a few indications on how to do it.
If you are interested about this project or you want to participate, you should check out the Launchpad entry.
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