Please follow the iPhone specific steps in the Community article below:

1. Make sure your iPhone software is up to date.

Updating to the latest version of iOS software provides the latest features, security updates and bug fixes:

1. Open ‘Settings’.
2. Tap ‘General’.
3. Tap ‘Software Update’.
4. If you have an iOS update available, tap ‘Install Now’. If you see ‘Download and Install’ instead, tap it to download the update, enter your passcode, then tap ‘Install Now’.
5. If you see ‘iOS is up to date’ - you’re good to go!

2. Check Date & Time.

iMessage will only activate if the Date & Time is set correctly on your iPhone. Here’s how to double check:

1. Open ‘Settings’.
2. Tap ‘General’.
3. Tap ‘Date & Time’.
4. Ensure the ‘Set Automatically’ toggle is switched ON.

3. Re-enter your Mobile Number.

In most cases, re-entering your Mobile Number on your iPhone can resolve issues with iMessage and FaceTime.

1. Open ‘Settings’.
2. Tap ‘Phone’.
3. Tap ‘My Number’.
4. Enter your mobile number, using +44 instead of the first 0.
5. Tap ‘Save’.

4. Reset iMessage and FaceTime.

This forces your iPhone to re-register your correct number with Apple's services.

1. Open ‘Settings’.
2. Tap ‘Messages’.
3. Set the ‘iMessage’ toggle to OFF.
4. Go back to ‘Settings’.
5. Tap ‘FaceTime’.
6. Set the ‘FaceTime’ toggle to OFF.
7. Restart your iPhone completely (turn it off and back on).
8. Once your iPhone has restarted, open ‘Settings’.
9. Tap ‘Messages’.
10. Set the ‘iMessage’ toggle to ON.
11. Go back to ‘Settings’.
12. Tap ‘FaceTime’.
13. Set the ‘FaceTime’ toggle to ON.

You may see a ‘Waiting for activation...’ message for a few minutes. Be patient. Afterwards, open ‘Settings’, tap ‘Messages’ then ‘Send & Receive’. Your correct number should now appear with a checkmark next to it.

5. Remove Old or Inactive SIM Profiles

Sometimes, your phone can get confused if your SIM or eSIM from your previous network provider is still installed. Here’s how to check:

• If you used a physical SIM card with your old network:

  • Turn off your iPhone, open the SIM tray, and ensure only your iD Mobile SIM is present.

• If you used an eSIM with your old network:

  • Open ‘Settings’ > Tap ‘Mobile Service’. If you see an old eSIM profile from your previous network, tap it and then tap ‘Delete eSIM’.

• If you requested a replacement iD Mobile eSIM:
  • We recommend deleting your old eSIM profile first, if you're able to. Don't worry if you can't do this (for example, if your phone was lost, stolen, or has already been reset). 

6. Deactivate iMessage and FaceTime.

Deactivating iMessage will unlink the number from your Apple iD, you can check by going into ‘Settings’, selecting your Apple ID at the top of the screen and tapping ‘Sign-In & Security’.

1. Open ‘Settings’.
2. Tap ‘Messages’.
3. Tap ‘Send & Receive’.
4. Ensure all mobile numbers and emails are unchecked. Then, tap your Apple ID.
5. Tap ‘Sign Out’. Go back to the previous page.
6. Tap the toggle to turn off iMessage. Go back to the previous page.
7. Tap ‘FaceTime’.
8. Ensure all mobile numbers and emails are unchecked. Then, tap your Apple ID.
9. Tap ‘Sign Out’.
10. Tap the toggle to turn off FaceTime. Go back to the previous page.

7. Force restart your iPhone.

If you’re using a physical SIM card, remove your iD Mobile SIM, but pop your SIM tray back into your iPhone.

If you’re using an eSIM, open ‘Settings’ > Tap ‘Mobile Service’, select your iD Mobile eSIM, and switch the 'Turn On This Line' toggle to OFF.

Then restart your iPhone. For iPhone 8 and newer, here’s how:

1. Press and quickly release the Volume Up button.

2. Press and quickly release the Volume Down button.

3. Press and hold the Side Button until the Apple logo appears, then release.

Once your iPhone restarts, connect to a stable Wi-Fi network and wait 30 minutes. After this time, re-insert your iD Mobile SIM or toggle your eSIM back ON.

The above steps should update the number on your Apple ID. You can check by going into ‘Settings’, selecting your Apple ID at the top of the screen, and tapping ‘Sign-In & Security’. The correct number should appear under ‘Email & Phone Numbers’.

8. Reactivate iMessage & FaceTime.

To reactivate iMessage & FaceTime, follow these steps:

1. Open ‘Settings’.
2. Tap ‘Messages’.
3. Tap the toggle to turn on iMessage.
4. Tap your mobile number. Then tap ‘Done’.
5. Tap ‘Send & Receive’.
6. Tap ‘Use your Apple ID for iMessage’. Go back to the previous page.
7. Tap ‘FaceTime’.
8. Tap ‘Use your Apple ID for FaceTime’.

In most cases, your iMessage & FaceTime should activate straight away, but in some cases it can take up to 48 hours. It might be tempting, but don’t toggle iMessage or FaceTime off & on again during this time as this will reset the activation.

9. Perform a Network Settings Reset.

As a last resort, perform a Network Settings Reset on your iPhone. Here’s how:

1. Open ‘Settings’.
2. Tap ‘General’.
3. Tap ‘Transfer or Reset iPhone’.
4. Tap ‘Reset’.
5. Tap ‘Reset Network Settings’.