Highlights Currently, users who are willing to send messages to their contacts will be asked to scan a QR code to further get access to WhatsApp Web. The multi-device support for beta testing on WhatsApp removes this problem by letting WhatsApp work on users' primary smartphone and up to four other devices. WABetaInfo said that the Facebook-owned messaging platform might add support for adding additional devices (like smartphones or tablets) at a later stage. Popular messaging platform WhatsApp is set to launch multi-device support for users in 2021 as it has been working on this feature for quite some time now.