1. Windows Central Question's Avatar
    after travelling for 15 days outside India I tried to use my old sim but it shows no sim or invalid sim only emergency calls if my mobile operator supports
    09-02-2015 05:53 AM
  2. Harrie-S's Avatar
    This could be a phone or SIM card issue.
    Please check if your SIM tray is "dirty".
    Please try another SIM to see if this works.
    If another SIM works but your old SIM not please contact your provider for a new SIM.
    If no SIM card works and there is no "dirt" in the SIM tray a soft or hard reset could help if it is a software issue. If both do not work you have a "hardware" problem and a visit to a repair shop may be needed.

    Good luck
    09-03-2015 12:24 PM

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