Contact Your Mobile Carrier's Customer Service

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There are free third-party apps on the Google Play Store (e.g., "My Phone Number," "WhatIsMyNumber") that claim to display your phone number by reading your SIM card.

Use with Caution: While some are legitimate, always be careful when downloading third-party apps and review their permissions. Ensure they come from reputable developers. If an app asks for excessive permissions not related to its function, it's best to avoid it.
If all else fails, or if you're using a very old or unusual phone, you can always call your mobile carrier's customer service line.

How to Do It: Use another phone (a landline, a friend's phone, or another slovenia phone number list mobile) to call your carrier's general customer service number. You'll likely need to provide some account verification (like your name, address, or account PIN) to confirm your identity, after which they can tell you your phone number.
Carrier's Support Number: This is usually available on their website, previous bills, or by searching online for "[Your Carrier Name] customer service number."
Check SIM Card Information (Physical Inspection)
In very rare cases, if you're still having trouble and can safely remove your SIM card, sometimes a portion of the phone number is printed on the SIM card itself (though this is less common with newer SIMs). You'd need to carefully eject the SIM tray to check.