How to monitor SIM state change

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The Intent android.intent.action.SIM_STATE_CHANGED is broadcast when the SIM state changes. For example, on my HTC Desire with a T-Mobile SIM card, if I put the device into flight mode the following Intent is broadcast:

  • Intent: android.intent.action.SIM_STATE_CHANGED with extras: ss = NOT_READY, reason = null

If I then take it out of flight mode, the following Intents are broadcast:

  • Intent: android.intent.action.SIM_STATE_CHANGED with extras: ss = LOCKED, reason = PIN
  • Intent: android.intent.action.SIM_STATE_CHANGED with extras: ss = READY, reason = null
  • Intent: android.intent.action.SIM_STATE_CHANGED with extras: ss = IMSI, reason = null
  • Intent: android.intent.action.SIM_STATE_CHANGED with extras: ss = LOADED, reason = null

It is possible that different manufacturers and different models behave differently. As they say, “Your mileage may vary”.

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