Before You Update Your WhatsApp Messenger. Read this:

A few days ago, Whatsapp announced that the'll be restricting
support to all blackberry, Nokia S40, S60 and older android
smartphones. This implies that this phones can't use whatsapp any
longer.
Just this morning i got a push notification to update my whatsapp to
the latest version and BOOM, There goes my whatsapp from my
blackberry phone.
Anyway, that's the only way they can stop us from using whatsapp
on this devices. So if you still wish to use your whatsappp on you
Nokia, Blackberry, Just ignore the push notification to update your
whatsapp that way you can still use the app.