How to turn on developer options in android phone

1. First of all you need a android phone with the android version 4.0 or above
2. Now go to settings.
3. In the settings at last you find one option About phone.
4. Now click on about phone.
5. After that you will get all details of your phone like android version etc.
6.  Now you can see one option BUILD NUMBER.Now click 7 times on build number.
7. Thats it,Now go to main settings and you can find option like developer options.
8. Now click on that option and click on turn on developer options button
9. Now developer options are truned on on your android device