In order to hard reset a BenQ-Siemens C31, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BenQ-Siemens C31 device will be brought back to the default configuration of a brand new device.


1. Make sure that your phone is on.


2. Open up Dialer and enter this code - *#9999#
3. Your phone will now restart. The hard reset is complete.