WhatsApp allows you to save on calls and SMS, providing the opportunity to carry them over the mobile Internet or Wi-Fi. Thus, if you have to pay, then only for traffic, making calls and SMS is completely free.
If you are using WhatsApp for the first time on your device, you will need to log in using the phone number when you first start it. To deceive the application will not work the confirmation code must come to the phone from which it was requested. After logging in to the application, subscribers from the address book, which are also connected to WhatsApp, will automatically appear in your list of available contacts.
The application allows you to chat using emoticons and stickers. You can create group chats with an unlimited number of users, which is especially important for corporate employees, students or schoolchildren of the same group /class. Authorization in the application is carried out by phone number, which greatly simplifies the use of the program on any device (including PC, which has a separate version of the program).