You will not be able to use two numbers at once in your WhatsApp. Even Samsung or no matter what the company is, its not possible to use WhatsApp on both the sims at once. Infact, if you have to do that, WhatsApp will have to allow its users to install WhatsApp twice in their phones so that they can use One number for each WhatsApp. WhatsApp isnt doing that as of now. So you wont be able to use two numbers at once in your WhatsApp no matter what your phone is.