Why do you need a mobile phone number to learn photography?

Confirm that I am registered. When learning photography, you need to fill in a registration information and make sure you fill it out yourself. According to the registration information, you also need a mobile phone number. You must fill in the applicant's mobile phone number. After filling in the mobile phone number, someone will contact you and arrange a course for you. So learning photography needs to confirm that I have registered my mobile phone number. In recent years, economic development has promoted the prosperity of commodity economy, and photography is also very promising.