1. Hardware

HTC Touch Diamond for NTT DoCoMo (HT-02A). https://handwiki.org/wiki/index.php?curid=1497647

HTC opted for resistive technology for the touchscreen. The reason cited by Horace Luke, HTC's Chief Innovation Officer, was that the resistive touch screen is better for Asian character recognition.^[1] However, the buttons beneath the screen, as well as being pressable buttons, have capacitive touch sensitivity. This feature is used by the camera application to auto-focus the camera as a finger approaches to press the button that will take a picture.^[2]

Luke also noted that this is the thinnest device that HTC has designed to date.^[3]

Some people find that the Touch Diamond's battery life is too short. Consequently, batteries offering double the capacity of the included battery are being sold by third parties and HTC itself sells an extended battery with 50% extra capacity.^[4][5]

The screen turns itself off when a person is on a call. This is to prevent the screen accepting unwanted inputs from the user's face when they are making a call, but it also requires the user to turn the screen back on if they want to use the screen. Removing the stylus when in a phone call both turns on the screen and starts up the notes application (if so selected as an option by the user).^[6]

2. Software

TouchFLO 3D on the HTC Touch Diamond. https://handwiki.org/wiki/index.php?curid=1787752

In addition to the standard features of Windows Mobile, the following additional software is included on the Diamond:

2.1. TouchFLO 3D

TouchFLO 3D Home tab. https://handwiki.org/wiki/index.php?curid=1367487

The Touch Diamond uses HTC's unique TouchFLO 3D user interface. This interface makes it easier for users to accomplish common tasks using their fingers rather than a stylus. TouchFLO 3D consists of tabs, and the user switches between tabs by sliding his or her finger along the row of tabs at the bottom of the screen. The 10 tabs are:^[7]

• Home - Displays the date and time, the time the alarm is set for, any missed calls, and upcoming calendar appointments. Flicking the clock upwards reveals more appointments.
• People - Shows pictures of contacts in a rolodex style which can be flipped through. An alternate slider bar of contacts is also included on the right side of the tab for faster browsing.
• Messages - Displays the 25 last received text messages that fly on and off screen.
• Mail - Displays received email messages, from up to 4 different email accounts, in an envelope. Individual emails may be flipped through.
• Internet - Displays a link to open the Opera web browser, bookmarks to favorite websites, and a built-in YouTube application.
• Photos and Videos - Shows photos and videos that can be flipped through, and buttons to launch the camera to take pictures and record video.
• Music - Displays cover art of music that flips through in a linear format. Music can be played directly from the tab, and can be forwarded/rewound by touching the progress slider. The library, which can be accessed pressing the Left Softkey, also uses the TouchFLO 3D interface to allow users to sort music by:
  • Now Playing
  • Artists
  • Albums
  • Playlists
  • All Songs
  • Genres
  • Composers
  • Purchased
• Weather - Displays weather for up to 10 cities, including a 5-day forecast.
• Settings - Provides access to the following system settings:
  • Sync Data - to start ActiveSync
  • Sound - to change the ringtone and profile settings
  • Wallpaper - to set the background image of the Home tab
  • Communications - to turn Airplane Mode, Phone, Bluetooth, and Wi-Fi on or off
  • Data - to change weather download settings
  • About - displays TouchFLO 3D version information
• Programs - Displays a grid of 18 programs that the user can choose to allow them to launch programs quickly. A list of every program installed on the device is also available.

Each tab has two soft keys which provide access to functions associated with a tab or tab customisation (the 'More' softkey usually takes the user to the applicable Windows Mobile-menu). The background of the Home tab can be customised via the Settings tab.^[7]

2.2. Opera

The Touch Diamond uses Opera Mobile as its default Web browser, though Internet Explorer, a standard part of Windows Mobile, is also included. It offers features such as tabbed browsing, improved zoom features, and text reflow.^[8] The browser can change the orientation of the page between portrait and landscape modes depending on the way the accelerometer senses the device is being held (not in Internet Explorer). Opera is also capable of downloading any file directly to the device, as long as the device's internal storage has enough free space.

2.3. YouTube

The Touch Diamond includes a YouTube program that allows users to search for videos, maintain a list of their favorite videos, and view featured videos.

2.4. Teeter

Teeter is a videogame utilizing the accelerometer of the Touch Diamond in which the player guides a ball to a target by tilting the device, avoiding obstacles such as walls and holes. The device vibrates when the ball hits a wall, giving the illusion that a real ball is inside the device.

3. Android

The XDAndroid project makes it possible to run Android on HTC Windows Mobile phones, including the Touch Diamond.

4. Sales

Over one million units were shipped in six weeks, compared to the HTC Touch, which took 5 months to reach the same milestone. HTC consequently raised its sales projection for 2008 from two to three million units.^[9]