As announced in our blog, WhatsApp will no longer be supported on Windows Phone 7 by the end of 2016. This means that if you are currently using WhatsApp on a Windows Phone 7, you will be able to continue to use WhatsApp on that phone during this period.
However, as part of this process, after July 1st, 2016 it will not be possible to create a WhatsApp account on a Windows Phone 7 nor move a WhatsApp account to a Windows Phone 7.
As of July 1st, 2016, the requirements to begin using WhatsApp on a Windows Phone are the following:
WhatsApp Support Team