Understanding Your Phone 132. 3.5mm Headset jack: allows you to plug in headphones.3. Volume keys: allow you to adjust the ringer volume whilein standby mode or adjust the voice volume during acall. When receiving an incoming call, briefly pressdown either volume key ( ) to mute the ringtone. Adjusts text size when reading a message.4. Microphone: allows other callers to hear you when youare speaking to them. It is also used for theSpeakerphone.5. Power/Accessory Interface connector: allows you toconnect a Travel Charger or other optional accessoriessuch as a USB/data cable or a hands-free headset forconvenient, hands-free conversations.6. Power/Lock key: ( ) lets you power yourphone on and off. Also allows you to lock or unlock thetouch screen. For more information on locking yourphone, see “Locking and Unlocking the Phone” onpage 20.7. Infrared Blaster: Used to emit infrared signals used forcontrolling external devices.Rear View of Your Phone1. Camera lens: is used to take pictures and shoot videos.2. External speaker: allows you to hear when theSpeakerphone is turned on.3. Flash: is used to provide additional light when takingpictures in dark places.213