"Whatsapp.who needs an explanation for it.Who will really needs someone else’s review about it.Its just awesome.I am just sharing my great experience with it.
Pros:
Simple n Elegant user interface
Easy to use
No need of Login
Easy to Port
no need to remember any pin or password, connect with your friends, just by using their mobile number
both end encryption, CRYPT8 for storing database ensures your chat will not be stolen even if the hacker has got access to your storage space
pc support by using web.whatsapp.com
Cons:
not much.
only thing I could come up with is its not that lite weight"