Whatsapp is the must-have messaging app for every smartphone users almost everyone who use smartphone use whatsapp messenger its very good messenger and also now it offers end to end encryption for its user which is very good means you chats are 100% protected and you can freely talk with anyone the concept of the app is very good you can send unlimited messages to anyone who is on whats app
But app needs internet connection it can smoothly work even 2G network for sending messages and you need 3G network or wifi for sending music and videos you can do it on 2G but it may take long time for good experience I recommend to use 3G and for video call 4G will be the best choice you need an active phone no. for registering on whatsapp there are no hidden charges of whatsapp only charges of mobile data and wifi may be applicable.
Otherwise whats app is completely free messaging app it was paid initially but now it is free at least in India not sure about other countries and layout and design of the whats app is very simple and easily understandable anyone can understand it without any problems and whats app is upgrading its features day by day most common function is messaging and you can also send pictures, media, videos, audio, voice notes, and documents its very easy way to connect with others.
It also offers audio calls and videos calls to other users which use mobile application of whatsapp and whatsapp is very useful messengers even it is very useful for business . yes you are right some of friends father use whatsapp for help in business because the wholesaler send the pictures of he products on whatsapp which makes their business easy and saves there lots of time I personally use whatsapp for chatting with my friends . whatsapp also provide making group feature which is very useful for connecting . for our institute there is a whatsapp group of the students in which all updates about the institute update so it makes easy to connect with all the members by just sending one message . there is also one feature of whatsapp which is broadcasting you can broadcast a message to all the members which are in your contact list . which is very useful if you want to share any information from all your relatives and friend you can just make a broadcast list and send a message to list and everyone in your list who is having your no. in their contact list will get your message which is a very useful feature I have found . over whatsapp is a great messaging platform