Your phone number(s) should be displayed there, often under "My phone number" or "Phone number (SIM slot 1/2)".
Calling Another Phone:
The simplest method if you have access to another phone (a friend's, family member's, or even a landline). Just make a quick call or send a text message to that phone, and your number will show up on its Caller ID.
Check Your Carrier's App or USSD albania phone number list Codes (if applicable):
While the phone settings usually show it, if not, your mobile carrier (like Grameenphone, Robi, Banglalink, Airtel in Bangladesh, or Vi, Verizon, T-Mobile elsewhere) will have specific methods:
If you have your carrier's app installed (e.g., MyGP, MyRobi, MyBL, MyAirtel), log in. Your number is usually displayed on the home screen.
USSD Codes: Each carrier has specific USSD (Unstructured Supplementary Service Data) codes to check your own number. You can search online for "[Your Carrier Name] how to check my number USSD" (e.g., "Grameenphone how to check my number USSD").
For Vi (Vodafone Idea, India) specifically, if that's your carrier:
If your number shows as "Unknown" in the phone settings, it means it's not programmed onto the SIM card, and you'll need to use one of the other methods.