The T-Mobile G1 was developed by HTC and was the first phone to run on the Android operating system.
The G1 (also known as the HTC Dream) was first announced in July 2008 and was released in the United States in October of that year.
The G1 featured a 3.2-inch touchscreen display, a slide-out QWERTY keyboard, and a trackball for navigation.
It was the first phone to include support for the Android Market, which later became the Google Play Store.
The G1 was also the first phone to include Google Maps with turn-by-turn navigation, which was a free feature at the time.
The G1 had a 5-megapixel camera and supported 3G data speeds, but did not have WiFi or a front-facing camera.
The G1 had a built-in accelerometer, which allowed the screen to automatically rotate when the phone was turned.
The G1 was not a global release, it was initially available only in the US, UK, and Germany, and later on other countries.
Initially, the G1 was only available in a single color: white.
T-Mobile G1 was not a commercial success, but it paved the way for the development of Android OS and the success of future Android smartphones.