Some of you guys are thinking that why one need to start android phone in recovery mode. Answer is that it's needed if one need to root their phone, OR one more important thing happens most of time is that, people enables screen lock using pattern lock or pin code system. And then forgets the pattern ( or someone enters wrong pattern more than limit and it locks).
So, at that time recovery mode is necessary.
Here is the simple steps.
first of all power off your phone .
Now, read carefully, press and hold home button, volume +, and then hold power on button
hold it until phone vibrates, (don't worry still screen is black.)
Note : this trick works in most of samsung phones.
