1. Windows Central Question's Avatar
    my card is activated it just shows the sim card is missing or invalid
    12-08-2014 02:02 PM
  2. jmshub's Avatar
    Make sure you have the SIM card installed in your phone before you power it on, or else it may not read it properly.
    xandros9 likes this.
    12-08-2014 02:57 PM
  3. xandros9's Avatar
    The card or card reader could be damaged (worse case scenario)
    12-08-2014 06:25 PM
  4. MDK22's Avatar
    ... or the SIM card is bad, or the SIM card is upside down (I know it only goes in one way) or, could you have the SIM card in the microSD card slot ?

    Is it an AT&T SIM card, because the Lumia 520 comes locked to AT&T (unless you unlock it, or bought a factory unlocked phone). It'll work w some MVNOs, but ...
    xandros9 likes this.
    12-08-2014 06:57 PM

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