WhatsApp is now, world mostly used messaging app. Now we can use a decent and clean good looking web app also available. group messaging and voice calls are very useful. Now a days peoples replace SMS with WhatsApp messages. WhatsApp is free service and no need to create account for use it, as other messenger like fb messenger need account creation and activation. Also paid version is available as low as Rs 55/- per yr.
For account creation, we need to type only the our phone number and verify automatically, by text msg or voice all to that number.
WhatsApp setup is easy as anyone can use, even if you are a first time smartphone user.
Also user can change the background with your favorite image.
Broadcast messgaing is very helpful to keep updation for our friends with a single action