How to use two whatsapp accounts on one phone I have a Samsung galaxy Duos and want to use my two whatsapp accounts at the same device. Is it for example possible to run dual two whatsapp client apps on one phone?
You can't install an app twice unless you go deep down hacking.

I don't know how WhatsApp works but you may just be able to put multiple accounts to one device. These accounts then may be handled separately by a single app. You can also try to look for alternatives if WhatsApp doesn't support multiple accounts.