How to check the number of this mobile phone?

If you use a vivo phone, the method for inquiring the phone number is as follows:

Enter mobile phone settings-mobile network/dual card and mobile network -SIM card information and settings-Mobile/Unicom/Telecom/Radio and Television -SIM card number.

Some SIM cards don't display numbers. You can call your friends and confirm the numbers before displaying them.

If you have more questions, you can go to this link page to consult online customer service for details.