
keePINcode will give you this phrase helping to keep that code in mind: "Please mind the gap." Whenever you need the code, maybe to unlock your phone or at the ATM just press the buttons with these numbers P-M-T-G and your PIN code will be entered.
If you don't like this phrase (maybe if you have never been to London) you can get a different one pressing the new button on the left.
When I read about this guy I was happy to own that app on my phone:
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My pin code is safed in my brain... rofl.