The first step you need to take, therefore, is to take your iPhone, and tap on the Settings icon (the one shaped like a gear wheel) that you find on the home screen and/or in the iOS App Library.
In the screen now visible, tap on the Cellular item and on the SIM PIN item. At this point, tap on the Change PIN wording, type the current PIN using the numeric keypad shown and then press on the Done wording in the top right.
Next, enter the new PIN that you intend to use always using the numeric keypad and press once again on the Done wording in the top right.
That's it! By carrying out these simple steps you have finally managed to change the SIM PIN code on your iPhone. From now on, the old PIN will be decommissioned and every time you turn on your iPhone to access the network you will have to type the code you just chose in the screen that is proposed to you. Since it wasn't a complicated thing?
Of course, if you change your mind, you can reset the card's "original" PIN code by simply going back to the Settings > Cellular > SIM PIN section of iOS, selecting the Change PIN option, typing the custom PIN as the current PIN and pressing the Done option, and entering the original PIN as the new PIN and also pressing the Done option.
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