You can easily do that by taking this step-by-step process
First download whatsaap in your smart phone from your mobile app store, if you are old user than delete your mobile number from whatsapp account.
After download completes install whatsapp in your smart phone and then close it. Don’t move on to next step.
Now we need to verify mobile number, so to verify mobile number we need to install one another application called “Text +“. We have to install Text + app because to verify mobile number.
Now after install Text + app, open the app >> navigate to “settings” panel >> move forward and select “contact“.
Now you will get a private number in that app for your use, copy that given mobile number in Text + app.
Open your whatsapp messenger app and at the phone verification paste that copied number and press continue.
Now wait for a few seconds you will receive a verification code in your Text + app.
After getting whatsapp verification code, copy that code and use it for whatsappverification.
That’s it now continue to start chatting on whatsapp without phone number.