Once you install WhatsApp on your device, it automatically builds up a separate contact list (filtering out the contact numbers from the device), which are registered users of WhatsApp. It uses the SIM carrier’s network or Wi-Fi (when available) to send/receive messages to your contacts, which exist in your device’s address book and also have WhatsApp installed in their individual devices. Be it Android, Blackberry, iPhone, Windows phone or Nokia phones WhatsApp is supported in all.
NOW, Learn how to use it with similar ease in your Tablet PCs.