Nokia Asha 311 - My phone does not recognise my SIM card

  1. Restart your phone. 
  2. Check that your SIM card is fully inserted.
  3. Do not use SIM cards that have been modified to fit the SIM slot. If a regular SIM card has been cut to a smaller SIM format you will have to contact your operator to order a replacement SIM.
  4. If possible, try your SIM card in another phone, or another SIM card in your phone.
  5. Your phone may be SIM locked, which prohibits using a SIM card from a different network operator. Contact your network operator to confirm if your phone is locked. They can provide the unlock code and instructions on how to use it.