When it comes to communication with other BlackBerry users, BlackBerry Messenger is the default IM client.

When, however, you have contacts that use other smartphones, we know that you need a good cross platform IM client because you want to stay in touch with those contacts as well.

This is why you should check out WhatsApp Messenger

Not familiar with WhatsApp Messenger?  Here’s how it works…

WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.

WhatsApp Messenger for BlackBerry has recently been updated to version 2.7.6401 and is available for download via BlackBerry App World.  You can also pick it up OTA by pointing your devices browser to http://www.whatsapp.com/ota/.