

Messaging: If you ever have a secondary phone, like for your job, install there whatsapp for business related matters and add your personal account. Connect to web.whatsapp.com from your personal phone enabling desktop view and get the QR. Then, on your business phone, on your personal account, go to the add another device menu to read the QR. Save the app. Reescan the QR every 2 weeks (when it logs out). The interface is sh*t for mobile, but it works.
How is it so fast?