Features-2

Other inputs

The display responds to three sensors: a proximity sensor that shuts off the display and touchscreen when the iPhone is brought near the face to save battery power and to prevent spurious inputs from the user's face and ears, an ambient light sensor that adjusts the display brightness which in turn saves battery power, and an accelerometer, which senses the orientation of the phone and changes the screen accordingly, albeit in only one 90 degree direction.

A single frontal hardware button brings up the main menu. Subselections are made via the touchscreen. The iPhone utilizes a full-paged display, with context-specific submenus at the top and/or bottom of each page, sometimes depending on screen orientation. Detail pages display the equivalent of a "Back" button to go up one menu.
The iPhone has three physical switches on its sides: sleep/wake, volume up/down, ringer on/off. All other multimedia and phone operations are done via the touch screen.

Phone

The iPhone allows conferencing, call holding, call merging, caller ID, and integration with other cellular network features and iPhone functions. For example, a playing song fades out when the user receives a call. Once the call is ended the music fades back in.

The iPhone will include a Visual Voicemail feature in conjunction with AT&T Mobility, formerly Cingular Wireless, which allows users to view a list of current voicemail messages onscreen, without having to call into their voicemail. Unlike most other systems, messages can be listened to in a non-chronological order, by choosing messages from an on-screen list. AT&T completely reworked their voicemail infrastructure to accommodate this new feature designed by Apple.

SMS messages are presented chronologically in a mailbox format similar to Mail, which places all text from recipients together with replies. Text messages are displayed in speech bubbles (similar to iChat) under each recipient's name.