And in front of me is ldk42 and let me show you how to change, pin to your sim card on the following device. So, first, you need to reach the settings then find and select lock, screen and security, and now click on setup, sim card lock here smoothly, click on change, sim pin, and now we need to enter the current one in my case is one two: three four clicks on. Ok, then, and as you can see here, you can enter the new pin. It must be four to eight degrees long. So let me enter one two three four five six tap on okay and then confirm it by entering the same color again so one two, three four five six tap on. Okay and that's it as you can see, Simpson has been changed.
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Source : HardReset.Info