How do I set my Samsung Android smartphone to vibration (silent) mode?

Note: this guide uses images captured from the Samsung Galaxy S III. Though your specific Samsung Android smartphone may appear somewhat different to the photos below the steps required will be broadly identical those listed.

1. From the Home screen touch Phone.

2. Tap and hold on the hash ('#') key, as indicated below, to enable vibration mode. Tap and hold on it again to re-enable sound.