1. Windows Central Question's Avatar
    My lumia 640 xl started giving me the following error message - "The SIM card is missing or invalid . You can still make emergency calls if your mobile operator supports this. What could the cause of this error be?
    10-24-2017 05:13 AM
  2. pkcable's Avatar
    Welcome, please join the site so you can reply in this thread. See this link for instructions on how to join Windows Central.

    Have you tried reseating the SIM card? That is take it out and then put it back in. Also try restarting your phone. It is also possible that your SIM has gone bad, this DOES happen. Your carrier should be able to replace it often for free, or for a small charge.
    10-24-2017 08:29 AM
  3. Timbre70's Avatar
    Swop with another phone to see if it's sim card fault.
    pkcable likes this.
    10-24-2017 08:45 AM

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