Sometimes when you switch your number, the temporary mobile number that came with your new SIM remains in the settings of your phone. This should normally update itself to the correct number after restarting your phone, but in instances where it doesn’t please follow these steps:
iPhone.
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Sometimes, your iPhone may not have the correct mobile number saved. Follow the steps below to check, and if needed, update it:
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Open ‘Settings’.
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Tap ‘Phone’.
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Tap ‘My Number’.
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Enter your mobile number, using +44 instead of the first 0.
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Tap ‘Save’.
Please note: If you can’t enter the correct number, go to: Settings > Apple ID > Sign-In & Security > Email & Phone Numbers. Tap 'Add a Phone Number' and enter the correct number.
If you have an iPhone and get a “Not delivered” message when you send a text, check out this article for more information.
If you’re experiencing issues with iMessage or FaceTime after you switched your number, check out this article for more information.
How to update your number on WhatsApp.
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Open ‘Settings’ in WhatsApp.
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Tap ‘Account’.
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Tap ‘Change Number’.
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In the first field, type in the number you want to change, and in the second field, type in your correct number.
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Tap ‘Next’.
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Tap ‘Done’.
For more information, check out the WhatsApp guide here.
How to update your number on Google Chat.
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If you open your Messaging app and click Settings > Chat Features, does it show the correct number?
If it shows the incorrect one, head to https://messages.google.com/disable-chat, and you should be able to de-register the number. Once you've done this, turn off the Chat Features and the phone. Wait a few minutes, turn the device back on, and re-enable Chat Features. It should let you re-register/update to the correct number.
How to update your number on Samsung Messages.
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First, try updating the mobile number in your phone settings. To do this, just follow these simple steps:
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Open ‘Messages’.
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Tap ‘Advanced’.
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Tap ‘Phone Number’.
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Update the number.
If this doesn’t work, double-check what number is stored in your Samsung Account by following these steps:
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Open ‘Messages’.
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Tap ‘My Profile’.
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Tap ‘Profile Sharing’.
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Check what number is stored under ‘Registered Device’.
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If the wrong number is stored, turn the chat off and back on again.