Why do free movies require you to enter your mobile phone number?

They use two methods to defraud you: first, they ask you to enter your mobile phone number, and then ask you to send text messages several times, each time costing at least 5 cents, saying that they want to give you your password. It may not work after several times. I give you a password, which makes you a lot of trouble. Then I use your mobile phone number to defraud you of money until you don’t want the number. You say how terrible it is!!!!!!!!!!!!