What should I do if I forget my mobile phone number bound to the Guevara movie?

Call customer service to check for you.

If you have purchased movie tickets through this account, just provide the mobile phone number from which you received the text message. Or the theater, date, show time and seats where you bought the tickets before, they can also check

If you haven’t bought it before...then this number doesn’t matter, you have to register a new one.