How to Boot the Android Device into Recovery Mode

Recovery Mode of android mobile is usually used for hacking, testing and development. The most common use of recovery mode is for updating the boot type of the devices. For example you can use recovery mode to actually perform the root and un-root operations. Check how to boot into recovery mode in android devices:

How to boot the Samsung Galaxy S 19000 into recovery mode

Note: This key process can be used for android devices without camera buttons.

In order to boot Samsung Galaxy S 19000 into recovery mode you should press the volume up button+Power button+Home button (located at middle). So the process should be:

1. Turn your phone off.
2. Hold down "Volume Up keys" +"Home" and press "Power" until the screen light ups.
3. Press the three keys until green screen like below appears:

Congratulations, your phone will now enter into recovery.

For more clarifications you can have a look over here

How to Boot the Droid X into Recovery Mode

Step 1. Turn your phone off.
Step 2. Hold down "Home" and press "Power" until the Motorola logo appears.
Step 3. Release "Power" and continue to hold "Home" until an exclamation appears.
Step 4. Release "Home" and press the "Search" button once.

Congratulations, Your phone will now enter into recovery.

For Android devices with volume and camera buttons

You can log into Recovery mode of android mobile or android device by following process:

Step 1. Power off the device.

Step 2. Press "Volume Up" and "Camera button" until screen lights up.

Step 3. Your phone will now enter into recovery.