At night, I suddenly received several short messages from two mobile phone numbers almost at the same time. Could it be a leak of information?

There is no doubt that it is information leakage. Now the apps for mobile phones have the right to read address books and photo albums. Personal information is not very secure and cannot be prevented from being leaked and stolen. However, as long as there is no photo of your ID card or household registration book, it is impossible to borrow money with a mobile phone number, so you can't disclose these important information to others at will.