WhatsApp instant messaging program has updated features and developed improvements to the system, so from now on you can add contacts with a QR code, according to Wabetainfos specialized site.
With the QR code, you no longer need to share your phone number with anyone, like Messenger and Instagram, which does not require sharing of personal information.
Related Note: WhatsApp is deleted from these Monday chats that are not stored in Drive
With this new tool, WhatsApp tries to enhance user security, which no longer needs to provide its phone number to contact other people in the application.
Recently, WhatsApp used a new backup backup system, using the Google Drive Utility, which has no space limits.
Similarly, you can back up directly to other Android devices, or to a new mobile phone, when you choose to switch mobile.