I am a frequent user of whatsapp messenger from last 5 years or so. From the day, it has been launched a numerous amount of companies have come in the field of messaging apps but no one has been so successful. Other apps like telegram, hike, fb messenger came close to whatsapp but could not beat this one.
But Whatsapp messenger beat the BBM messenger(which was considered the best before this) soon after its launch.
On it you can easily connect with anyone, share images, videos, music, contacts, location etc and that too free of cost. Also, u can call on whatsapp these days.
The best thing I like in whatsapp is that they keep removing any bugs(which I have not experienced yet) time to time by rolling fresh updates.
The latest update rolled by whatsapp said it will be free of lifetime which will save our 50 rs per year to enjoy their services.(hard earned. LOL)
The only thing missing in the app is you cant share bigger files(which, I think, will be soon added in the most used messenger worldwide)
We dont ask anyone to message or call on phone these days, we only say ping me on whatsapp LOL