I have been using whatsapp for about 4 years now and have seen it growing from some to many and as a universal solution for messaging problems.
People came and adopted it because of increasing awareness and that now they need not to worry about the charges of long chats and with the call feature it bacame more popular.
Concept: the app is made with a concept to solve the problems of chatting that people had previously of big recharges, and network service providers taking benefit out of it, which I like the most. All you need to do is recharge with an internet pack and enjoy free chatting, it reduced the cost and increased the ease of talking to one another. They also added calling feature and now status feature which is good.
Layout and design: the app is well made and is very easy to use. Simple layout and design leads to hasslefree texting and forgetting the worry of getting tangled into features or settings. All you need to do is have the phone number of the people whom you want to text saved in the smartphone and now they will appear on the app, besides they also must have whatsapp.
Features and functions: Very simple and productive features are there in the app besides just able to text another user is that you can call through the app and no charges will apply because it is an internet call and internet is only thing needed for that and the same goes with video-call which you can do. More features include the new status feature where you can post something which remains there for a day and then dissappears. You can create groups, share photos, videos, documents, contacts, etc.
Usefullness: this messaging app is super useful as it makes very convenient to text, call and share things which were very tough to do early.
