We all know this, we want to send a message to someone but it is not saved in contacts.
There is no choice so we keep the number in the contacts, search for it on WhatsApp, find it and only then send a message.
Too bad you did not know! there's a choice!
Enter the "Quick Send" app, type in a phone number and connect to chat.
Just quick and easy.
Oh and it is possible to add a message in advance!

Download the app and save valuable time :)