What kind of information is it? If you are transferring money through online banking, there is a field where you can fill in your mobile phone number. Maybe he wrote his own mobile phone number. (If the text message displays, xxx "name of credit card owner" Hello, xxx "name of your friend", I will remit xx yuan to your card with the last number xxxx through xx bank online banking) This is normal. If you do not go through online banking, go directly to the business hall If you repay. Then it is impossible to have your credit card information. Unless he knows your personal information. For example, your ID number, card number, home phone number, etc. In this way, you can call customer service and ask, or change the bound mobile phone number. Another possibility is that he used your credit card to log in to online banking, which can also be changed on the web page.