On my Samsung Galaxy SIII, one can go to Settings -> More -> Security -> SIM card lock -> Set up SIM card lock -> Lock SIM card` which displays a check box which can be used to configure the phone to either (a) require the user to enter the SIM PIN when the device finishes booting up to access all of the device's features, or (b) to access the device without ever having to enter the SIM PIN, not even after the device has been booted.
- I would like to ask, where is the information about requiring or not requiring the PIN stored? Is it stored on the SIM card or on Android internal storage? In the first case, inserting the SIM in a new phone would preserve the setting, and in the second case it would not. Can anyone please confirm?
When the user is not required to enter the PIN, the PIN on the SIM card is not deleted and the user is in fact require to enter such PIN both when enabling or disabling this feature. Hence I would also like to ask:
- If the user changes the PIN. Is (1) the old PIN on the SIM card overwritten with the new PIN, or, (2) does the SIM card preserve the old PIN and store the new pin in some other location on the SIM card, or, (3) is the new PIN stored on internal storage leaving the SIM card unaffected? I'm not sure how I would go about checking this, but I would be interested in knowing the answer.