Skip to main content
New Contributor
September 25, 2026
Question

my SIM is showing as unknown umber also when i make calls it stating the sim is not registered to a net work

my sim is showing unknown  number also when i try to make calls it stating the sim is not registered, thi sis really annoying, never had this before ?

  

    1 reply

    Gemma M
    iD Mobile Employee
    iD Mobile Employee
    September 25, 2026

    Hi ​@sargon,

     

    I’m sorry to hear your SIM is showing as an unknown number and isn’t registering on the network.

     

    Please try the following troubleshooting:

    1. Restart your phone.
    2. Turn Airplane Mode on for around 60 seconds, then switch it back off.
    3. Remove the SIM, gently wipe it with a clean, dry cloth and reinsert it securely.
    4. Go to your Network Selection settings, turn Automatic selection off and allow the available networks to load. Try selecting iD Mobile/Three UK manually, then switch Automatic selection back on.
    5. Perform a network settings reset:
      • iPhone: Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.
      • Android: Settings > General Management/System > Reset > Reset Network Settings or Reset Mobile Network Settings.
    6. If possible, test your SIM in another unlocked handset to see whether it registers on the network.

     

    Please note that a network settings reset may remove saved Wi-Fi networks and Bluetooth connections.

     

    If the SIM still isn’t registering after completing the above, please contact our Live Chat team so they can check the SIM and service on your account and arrange a replacement SIM if required: https://www.idmobile.co.uk/live-chat

     

    Regards,


    Gemma M
    The iD Mobile Social Media Team

    Did my comment help answer your question? If so, don't forget to mark the response as the Most Helpful Answer.