human
How do I send a WhatsApp message to an unknown number?
assistant
Send a WhatsApp Message to an Unsaved Number
1. Open your preferred browser on your phone or tablet.
2. Go to  https://api.whatsapp.com/send?phone=XXXXXXXXXXX where X is the phone number you want to contact.
3. Tap Message when prompted.
4. Enter your message.
5. Tap the airplane icon to send.