The Android provides the phone's operating system as well as a platform for the phone to run a variety of software programs.
Google wrote Android using open-source software, which means any programmer has access to the source code that makes Android tick and can write software that runs on any mobile phone using Android.
Unlike the iPhone, the G1 features a mini QWERTY keyboard, which is accessed by sliding the touch screen to the side.
When the keyboard is used the screen's orientation changes from vertical to horizontal. The G1 can open files created using Microsoft Word and Excel.
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