Other

The iPhone's headphones are similar to those of current iPods, but also incorporate a microphone. Calls can be answered and ended by squeezing a bud, toggling the microphone. The 3.5 mm TRS connector for the headphones is located on the top left corner (as seen from front upright). Wireless earpieces that use Bluetooth technology to communicate with the iPhone are sold separately. The headphone jack is recessed and as a result many standard stereo headphone jacks require an adapter to work correctly, although some users have successfully modified existing jacks by cutting away several millimeters of rubber at the base of the jack to allow them to fit.^{[citation needed]}

The loudspeaker is used both for handsfree operations and media playback.

The SIM card is located in a slot at the top of the device, and the device is activated through iTunes.