1. Windows Central Question's Avatar
    it happened after upgrading to win8.1 .please reply
    11-22-2014 06:55 AM
  2. myst02's Avatar
    I would recommend backing up all data and doing a hard reset.

    Here's how to do a hard reset:
    1. Turn off your phone
    2. Press Vol Down + Power + Camera buttons
    3. An exclamation mark will appear on the screen
    4. Press these buttons in the following order: Vol Up,Vol Down, Power, Vol Down
    11-22-2014 07:00 AM
  3. RumoredNow's Avatar
    Your SIM may have gone bad. Is there another phone you can try it in?

    ​Check with your carrier for a new SIM.
    11-22-2014 10:40 AM

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