WhatsApp introduced web client for Android earlier this year. Later it was expanded to other platforms. WhatsApp Web has finally started rolling out for iPhone users. It was noted by a reddit user. It is available through a server-side update, so it will be pushed out automatically if you don’t have it yet. You can go to WhatsApp settings in the iPhone app, select WhatsApp web and scan the QR code that you get when you visit web.whatsapp.com from the desktop.
WhatsApp for iPhone got calling feature in April. It recently got updated to v2.12.5 with per chat custom notification settings and mute, videos in chat backups and lots more features. WhatsApp has 800 million monthly active users as of April and remains as the fastest growing messaging app.