# How to Check Your SIM Card Phone Number (UK): 5 Easy Methods
> Dial *#100# on your Vodafone UK SIM to check your phone number instantly. Alternative code *#101# also works. Updated May 2026.
**Published:** 2026-05-10
**Updated:** 2026-05-29
**Category:** HOW_TO_TELCO
**Author:** Rafael Tuñón
**Canonical URL:** https://rechargevodafone.co.uk/how-to-check-your-sim-card-phone-number-uk/
## Key takeaways
- Dial *#100# on your Vodafone UK phone to instantly display your SIM card's phone number.
- Try *#101# as an alternative USSD code if the first code doesn't work on your device.
- If your phone shows 'unknown' after dialling either code, your number may not be stored on the SIM card itself.
## Key statistics
- ***#100#**, USSD code to display Vodafone UK SIM number (Source: JustAnswer)
- ***#101#**, Alternative USSD code to display Vodafone UK SIM number (Source: JustAnswer)
- **34K**, views on 'How To Check Vodafone SIM Number' YouTube video (Source: YouTube (vijay raee))
## Article
Forgetting or losing track of your own mobile number is a common issue, especially with a new or infrequently used SIM card. Fortunately, there are several straightforward and reliable ways to find the phone number associated with your Vodafone UK SIM. This guide provides clear, step-by-step instructions for five distinct methods, from using a simple network code to checking your phone's settings.
## Method 1: Use the Official Vodafone USSD Code
The fastest and most direct way to retrieve your number from the network is by using a special code known as a USSD (Unstructured Supplementary Service Data) code. This is a free service that communicates directly with Vodafone's systems.
To find your number, insert the Vodafone SIM into a compatible phone, open the dialler app (where you would normally type a number to make a call), and enter the following code:
*#100#
After keying in the code, press the call button. Within a few moments, your Vodafone mobile number should appear on the screen. No call is actually made, and there is no charge for using this service. This method works on smartphones and basic feature phones, as it is a network function and does not rely on the phone's operating system.
## Method 2: Check Your Smartphone's Settings
Most modern smartphones automatically detect and store the number associated with the inserted SIM card in their settings menu. This is a highly reliable method if the USSD code fails or if you prefer a different approach.
### For Android Devices
The exact steps can vary slightly depending on the manufacturer (e.g., Samsung, Google Pixel, Motorola) and the version of Android, but the general process is similar:
- Open the Settings app.
- Scroll down and tap on 'About phone' or 'About device'.
- Select 'Status' or 'SIM status'. Your phone number should be listed under 'My phone number' or a similar field.
On some devices, the number may be found more directly under Settings > Network & Internet > SIMs.
### For Apple iPhones
Finding your number on an iPhone is very straightforward:
- Open the Settings app.
- Scroll down and tap on 'Phone'.
- Your number will be displayed at the top of the screen, next to 'My Number'.
Alternatively, you can open the Contacts app and your number will be listed at the very top under 'My Card'.
## Method 3: Use the My Vodafone App or Website
If you have an online account, the My Vodafone service is a secure way to view your number and other account details. The easiest way to do this is through the My Vodafone app, which is available for both iOS and Android devices.
Once you download and open the app, you will need to log in with your credentials. Your mobile number is typically displayed prominently on the main dashboard or within the 'My Account' section. You can also log in to your account on the official Vodafone website to find the same information.
## Method 4: Contact Vodafone Customer Services
If the automated methods do not work, you can speak directly to a customer service adviser who can confirm the number for you. The primary contact numbers are:
- 191: Free to call from your Vodafone mobile.
- 0333 304 0191: For calling from any other UK landline or mobile (standard call charges apply).
When you call, you may need to provide some details to verify your identity, such as your name, address, or account security information.
## Method 5: Simple Low-Tech Solutions
Sometimes the simplest solutions are the most effective:
- Call or Text a Friend: The most straightforward way to find your number is to call or send a text message to another phone. As long as you have not withheld your number, it will appear on the recipient's screen.
- Check the SIM Packaging: When you received your SIM card, it was attached to a credit-card-sized plastic holder. The mobile number is often printed on this packaging.
## Understanding Your SIM Card: Phone Number vs. ICCID
It is important not to confuse your phone number with the SIM card's serial number, also known as the ICCID (Integrated Circuit Card Identifier). The ICCID is a unique 18- to 22-digit number printed on the SIM card itself that identifies the physical card. You might need this number for tasks like activating a new SIM or transferring your number to a new provider, but it is not the number people use to call you. The USSD code *#100# will only display your phone number, not the ICCID.
## Quick Reference Guide
| Method |
Instructions |
Cost |
| USSD Code |
Dial *#100# and press call |
Free |
| Phone Settings |
Check 'About Phone' (Android) or 'Phone' (iPhone) |
Free |
| My Vodafone |
Log in to the app or website |
Free (data charges may apply) |
| Customer Services |
Call 191 from the SIM or 0333 304 0191 from another phone |
Free from Vodafone / Standard rates apply |
| Call a Friend |
Call or text another phone to see the caller ID |
Standard call/text charges apply |
## Quotations
> insert the SIM into a compatible phone and dial *#100# or *#101# to display the number
>, JustAnswer smartphone expert (https://www.justanswer.com/smartphones/pxsd3-uk-vodafone-pay-go-sim-card-however-can-t.html)
## Frequently asked questions
### how to check vodafone sim card phone number
Dial *#100# from the phone your Vodafone SIM is inserted in, then press the call button. Your phone number will appear on screen within a few seconds. If that doesn't work, try *#101# as an alternative USSD code.
### what does *#100# do vodafone
*#100# is a USSD code that prompts Vodafone's network to display the phone number linked to your SIM card. No actual call is made and you won't be charged. The number appears on your screen instantly.
### vodafone sim shows unknown number what to do
If your phone displays 'unknown' after dialling *#100# or *#101#, it means the number isn't stored on the SIM card itself. This is common with newer Vodafone SIMs where the number exists only on Vodafone's network records rather than on the physical card.
### can i check my vodafone number without calling
Yes, you can check your Vodafone number without making a call by dialling *#100# or *#101#. These USSD codes retrieve your number from the network and display it on screen instantly without any charges.
### vodafone *#101# not working what should i do
If *#101# doesn't display your number, try *#100# instead as both are valid USSD codes for Vodafone UK. If both codes return 'unknown' or nothing, your number may not be stored on the SIM and you'll need to contact Vodafone directly or ask someone to call you to confirm your number.
## Sources
1. [I have a UK vodafone pay as you go sim card however I can't ...](https://www.justanswer.com/smartphones/pxsd3-uk-vodafone-pay-go-sim-card-however-can-t.html) (www.justanswer.com)
2. [How to Find Mobile Number of Vodafone (Vi) SIM Card? - YouTube](https://www.youtube.com/watch?v=E32A2tQYpfc) (www.youtube.com)
3. [How To Check Vodafone SIM Number - YouTube](https://www.youtube.com/watch?v=I0AAlQKK96I) (www.youtube.com)