This is one of the simplest ways, as you know the incognito window will not save any information during use. In the following article, the software tips will guide you how to register for a Gmail account without a confirmation phone number. But don't worry, you still have a way to create multiple Gmail accounts without a phone number to sign up for verification.
If you need a lot of Gmail to send mail to many people with many different account names and addresses, creating multiple Gmail accounts will be very difficult for you if you do not have many junk Sims to sign up.