Anytime I check for a person’s email address, it always wants money. Were can I find a honestly free email finder. Using a persons cell phone, first and last name?

im trying to find an email for a friend of mine.. ( male) id love to send him a letter.. but have NO clue how to find out his email addy.. anyone have any free email finder sites to share??

I mean a free email finder, not one of those that you have to pay for and have a membership for! I need to email my teacher for an assignment that I won’t be able to do!

Does anyone know of a free email finder, as i had found one some time ago to find an old school friend, but I can’t remember what it was?