How to check whether the mobile phone card has been opened?

Dial 10086 with another number, press 1 and then press 1 to find other numbers, and enter the number and password of that card (the card office asked you to set it). You can check the consumption of that card. If the phone bill is less, it means it has been opened. Don't check the internet, don't check whether it is open, because surfing the internet is also one of the mobile services.