Use APKPure App
Get Open W old version APK for Android
App for sending Whatsapp messages to unsaved contacts.
A simple utility app for sending the whatsapp message to the contacts which are not saved in the contacts.
Comes in handy when someone calls you and ask for sending details/messages/location on whatsapp and you have to save that number and then send the asked details.
Just copy the number, append the country code add in some text, and just press send.