Whatsapp is a free-to-use messenger which allows to do free SMS and MMS. Just have your 3G and Wi-Fi on , and chat with your friends around the world. It is available in iPhone , Android , Blackberry , Nokia , Windows and Symbian. It one extensive feature is that it allows us to do international SMS and MMS.
Usually there is no limit on how long the messages are stored
for on their servers. Users may choose to archive messages to avoid
accidental deletion of the most important messages.