In order to hard reset a Siemens C60, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Siemens C60 device will be brought back to the default configuration of a brand new device.
1. Turn on the device.
2. Type in this security code, *#9999#
3. Wait for the phone to reset and restart.