How to check a phone number: your own and an unknown one
updated 11 July 2026
Quick answer
The fastest way to check your own phone number is in the phone's settings or by calling or texting a friend. For an unknown number that called you, type it into a search engine or a 'who called' site and read what others reported. Public tools won't reveal the owner's name, though, because personal data laws protect it.
Step by step
- 1
Find your number in the phone's settings
On Android, open Settings and look for a section about the phone or the SIM card - the number may sit under About phone, Status, or SIM card info. On an iPhone, open Settings, then Phone, and you'll see the number at the top in the My Number field. The exact path depends on the model and system version.
- 2
Call or text a friend
The surest way is to call someone or send a text - your number will show up on their screen. This helps when you have two SIM cards and don't know which number is in which slot. Save the number in your contacts right away so you don't have to look it up again.
- 3
Check the number in your carrier's app
After logging in to your carrier's app or website, your number appears in your account details. You'll also find it on the starter kit or the SIM card's packaging. It's a good option when the phone is new and you don't have anyone in your contacts yet.
- 4
Type an unknown number into a search engine
Copy the number that called you and paste it into a search engine, ideally in quotation marks. You'll often land on pages where others described who was calling: a company, a hotline, or a scammer. Check several results, because a single entry can be incomplete.
- 5
Look at 'who called' sites
There are number directories where users flag calls as spam, telemarketing, or fraud. Enter the number there and read the comments and the report count. Treat them as a hint, not a certainty, because the entries are added by anonymous internet users.
How to find out who a number belongs to
There is no legal, public database that gives you the owner's name from a mobile number. Subscriber data is protected by personal data laws, so reverse lookup tools only show what other users have reported - usually a spam label or a company name. That's enough to recognize a pushy call center, but you won't identify a private person this way.
Landline numbers can be easier, because some companies and institutions publish them openly on their websites. If a number claims to be your bank or a government office, don't trust the caller ID alone - numbers can be spoofed. When in doubt, hang up and call the institution's number that you find on its website yourself.
Careful when calling back unknown numbers
A popular scam is one short ring from a foreign or exotic number, known as the one-ring scam. When you call back, you connect to a premium line with a high per-minute rate, and billing starts immediately. If you don't recognize the country code, don't call back - wait until the caller reaches out by text or rings again.
Suspicious prefixes are often numbers from outside Europe that you don't know and aren't expecting. Instead of calling back, type the number into a search engine and check whether others have reported the same pattern. You can also block the number, so you're not tempted to call back and it can't ring you again.
Apps and the built-in spam filter
The Phone app on Android and iPhone can label a call as Suspected spam on its own, using a database of reports. Turn on caller ID and the spam filter in its settings, and some unknown numbers will be identified without any effort on your part. It doesn't replace checking yourself, but it screens out the most common nuisances before you even pick up.
If you want more data about a caller, reach for a dedicated caller ID app. Install them thoughtfully, because in exchange for identifying numbers they ask for access to your contacts and call history. Check what permissions they demand and pick programs that clearly explain what they do with your data.
Frequently asked questions
›How do I check my own phone number if I don't have it saved?
Call or text a friend - your number will show up on their screen. You'll also find it in the phone's settings in the SIM card section, or after logging in to your carrier's app.
›How do I check who a phone number belongs to?
Public tools won't give you the personal details of a mobile number's owner, because the law protects them. At most you'll learn whether others have flagged the number as spam or linked it to a company, by typing it into a search engine or a review site.
›Unknown number - how do I check who called?
Type the number into a search engine in quotation marks and browse the results and call-review sites. A high number of spam reports is a signal not to answer and to consider blocking the number.
›Is it safe to call back an unknown foreign number?
It can be costly, because some of these calls lead to premium-rate lines. If you don't recognize the number or the country, don't call back and wait until the person reaches you some other way.
›How do I check the phone number on a SIM card?
The number is often printed on the plastic starter card or its packaging. On the phone itself, look in the SIM card settings or in your carrier's app, where the number is tied to your account.