To enter recovery mode, turn off the phone, connect the USB cable, and then hold down Volume Up + Power.
If done properly, the phone will show the SAMSUNG and Galaxy S Plus screens and then end up at the "Android out of the box screen". Now press Menu to enter recovery mode.
The options for actually performing recovery when something is wrong with your phone are very limited with the stock recovery that comes preinstalled on your phone. However, you have the option to replace it with a much better, fully-featured recovery called "ClockworkMod Recovery" (CWM).
Getting into recovery mode can be a bit fiddly and you might need several tries. Connecting the USB cable makes it a lot easier. CWM recovery does not have this problem and boots reliably. If you are still having problems getting into recovery mode, download Easy Reboot Recovery.zip, unpack and run RebootRecovery.bat while your phone is connected with the USB cable. The phone will reboot into recovery mode.
Navigation in recovery mode is done using the Volume Up and Volume Down buttons to scroll up and down in lists and the Home button for choosing an item. Sometimes a simple push of the Home button is interpreted as two pushes so be careful. CWM recovery avoids this by using Menu as the enter key instead.
Recovery mode is a separate partition on your device that holds its own minimal Android system with a kernel and a small set of tools
Android_out_of_the_Box.jpg "Android out of the box" icon indicating successfully booted recovery mode"
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