In order to hard reset a Fujitsu Siemens T830, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Fujitsu Siemens T830 device will be brought back to the default configuration of a brand new device.
1. Start by removing the back cover from the phone.
2. Now hold down both End button + soft reset button.
3. Let go of End button when a new menu opens.
4. Select Skip and Factory Defaults. Done, the phone will now reset.