To find out one's own mobile number, the settings menu can be checked, or a call to another phone with a caller-ID can show the number. The service provider can also give this information.
One the phone, one option is to select the menu, and then navigate to "Tools," "Settings" or "Options." These labels vary by phone provider. Locate a tab that says "My Number" or something similar.
When calling another phone with a caller-ID, the number displays on the caller-ID screen as the phone rings. One can also contact the store or provider by calling the customer service number of that company, giving some information to verify the account and asking for the number of the phone.
The phone number is also displayed on the monthly phone bill. The number is typically listed toward the top of the bill by the billing information. Some companies choose to use the phone number as the account number.
Knowing the correct phone number for one's phone allows the owner to provide that information in the case of an emergency, in important business situations or in the company of family and friends. A phone number may also be necessary when filling out financial documents or opening an account with a business.