You can message anyone on WhatsApp, as long as their number is saved in your address book. If you don’t have the person’s number saved in your contacts, WhatsApp makes it difficult to text them.

This can be annoying if you want to contact someone just once, such as a courier delivery person who’s unable to find your address. In cases like this, you might want to text them on WhatsApp without saving their number.

Use Digimitra App to Send Whatsapp Message to any number without saving them in phone book contact. The App Works seamlessly with whatsapp regular and whatsapp business. It gives you option to choose between whatsapp regular and whatsapp business, for sending a message to unsaved number.

In short, It's a easy tool to whatsapp without saving mobile number.