The speakerphone key, on my Blackberry Tour, is towards the bottom right and is a little red horn where the $ key is located. If you are in a telephone call, pressing this button will place your call on the speaker so you don't have to have the phone to your ear. Everyone else can hear your conversation. To go back to privacy mode (normal) just press the key again. It's pretty handy if you are on hold listening to elevator music and you want to share that music with everyone else around you, LOL. Seriously, it is handy when you are driving and want to have your hands free.