WhatsApp allows users to send messages to unsaved numbers
Messaging service WhatsApp has launched a Click to Chat feature that allows users to send messages to unsaved numbers. Users can create their links using the URL 'https://api.whatsapp.com/send?phone=' followed by the person's phone number in international format. Users can also send a pre-filled message to their contacts using the URL 'https://api.whatsapp.com/send?text=' followed by the message. 