What is unlock code for Micromax A36

There are various methods to unlock Android device..

1. Easiest is to hard reset your device, it will come in factory state but all installed apps, settings will be lost.
It can be done as follows:
a. Turn of your phone
b. Hold Power+Volume up+Volume down together for about 30 seconds or so..
c. You will then boot into recovery mode , use volume keys to navigate up and down and power key to choose.
d. Choose Wipe DATA and choose wipe cache.
e. Now restart your phone.

It should be like brand new..

Other method is if internet is working in phone / its one then provide your google account login details when it asks for after giving wrong password multiple times, it should send you mail. I have done this once.

There are few more methods, like "Screen lock bypass" app. You may search google for more details.