By the way, if someone knows your mobile phone number, can they send you a video file?

Yes, the most basic thing is to use a mobile phone.

Text messages can be sent, as long as it does not exceed 300kb. Besides, where is personal privacy now? If you want to know you, spend some money or have your own resources and technology, you can find any information about you, such as email, WeChat, etc. And it is very simple to send you a video.

I don't know what's wrong with you, but you must protect yourself. If something bad happens, you must ask for help ~

Hope to adopt.