What Company Is Offering:
WhatsApp is a Smartphone-2-Smartphone instant messenger application and chat service that works over your existing internet data plan. Because WhatsApp 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 is currently available for iPhone and BlackBerry . iPhone and BlackBerry owners can message each other!
How It Works:
Simply download WhatsApp to your iPhone or BlackBerry device and it will automatically work. WhatsApp will always send you Push Notifications when you have new and unread chat messages from a contact.WhatsApp automatically works with your existing iPhone Contacts. There is no hassle of adding friends, creating accounts, or memorizing and sharing PINs and login names.No sign up is necessary.
They will ask for your phone number because that is how WhatsApp routes chat messages between you and your contacts, similar to how the regular SMS system would.