Passcode is most essential thing to secure your device. With iOS 9, Apple introduced
the 6-digit Passcode for more security of your device. Since then jailbreakers
are trying more modification with the default passcode of the iPhone. 

For those who didn’t know, you can set current time and reverse passcode on iPhone and iPad with jailbroken cydia tweak called Callisto

For those
who didn’t know, you can set current time and reverse passcode on iPhone and iPad with
jailbroken cydia tweak called Callisto.  Callisto
comes with configurable options like “Reverse Passcode” &
“Original Passcode Unlock”. 


Callisto
is available in Cydia via BigBoss Repo for $1.49 and is compatible
with iPhone and iPad running iOS 8 and 9.
After download and installed, you have
options to configure from the settings app in the tweak preferences where you
can enable or disable the tweak, configure options for 4 digit and 6 digit
passcode in which you can reversly use your passcode or use your real passcode
if you don’t want to use. You can find many cydia tweaks like TimePasscode
which works only for 4 digit passcode. 
But Callisto 1.0 offers “Magic
Digits” for 6-Digit Passcodes. The “Magic Digits” are the last
two digits.
There are (for now) 3 different options to choose between:

1. Double Zero! –
Your last two digits will be “00”. It´s easy to
remember and use with other options…
Example: If the time is 09:41, your passcode will be 094100.


2. Magic Digits! –
Choose between different magic digits and these will be the
last two digits of your Time Passcode.
Example: If the time is 09:41 and you have chosen Magic Digits “07”,
your passcode will be 094107.


3. Callisto Special! –
This option will calculate current (hour + minute) and
that will be the last two digits.
Example: If the time is 09:41, your passcode will be 0941+(hour + minute) =
0941 + (09 + 41) = 094150.

No worries if someone knows your passcode because your passcode will be changed
everytime according to your current time or you can reverse your passcode. So
Callisto is quite good for this reason but it will be unsafe if jailbreakers
find your iPhone/iPad.

If your device has not yet jailbroken then follow this simple steps on How to jailbreak iOS 9, 9.0.2 and 9.1
Are you going to try Callisto? Let us know in the comment below..