One loudspeaker is located above the screen as an earpiece, and another is located on the left side of the bottom of the unit, opposite a microphone on the bottom-right. Volume controls are located on the left side of the unit and as a slider in the iPod application. Both speakers are used for handsfree operations and media playback.
The 3.5 mm TRRS connector for the headphones is located on the top left corner of the device.[43] The headphone socket on the original iPhone is recessed into the casing, making it incompatible with most headsets without the use of an adapter. The iPhone 3G eliminates the issue with a flush mounted headphone socket.
While the iPhone is compatible with normal headphones, Apple provides a headset with additional functionality. A multipurpose button near the microphone can be used to play or pause music, skip tracks, and answer or end phone calls without touching the iPhone itself. A small number of third-party headsets specifically designed for the iPhone also include the microphone and control button. Apple sells headsets with volume controls, but they are not compatible with the iPhone.
The built-in Bluetooth 2.x+EDR supports wireless earpieces, which requires the HSP profile. Stereo audio will be added in the 3.0 update for hardware that supports A2DP. While illicit solutions exist, the iPhone does not officially support laptop tethering[48][49] or the OBEX file transfer protocol. The lack of these profiles prevent iPhone users from exchanging multimedia files, such as pictures, music and videos, with other bluetooth-enabled cell phones.
Composite or component video at up to 576i and stereo audio can be output from the dock connector using an adapter sold by Apple.Unlike many similar phones, the iPhone currently requires third party software to support voice recording. Apple is planning such an application for the 3.0 software update.[
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