Nokia Lumia 900 - Get started; Device Keys and Parts Overview

Get started
Keys and parts
1 Connector for headphones and loudspeakers (3.5 mm)
2 Second microphone
3 Micro-USB connector. Also used to charge the battery.
4 SIM card holder
5 Volume keys
6 Power key/Key lock button
7 Camera key
8 Search key
9 Start/Home key
10 Back key
11 Front camera
12 Earpiece
6Get started