Samsung ACE User Manual page 35

Using the End Key
The key can function differently depending on your
current task, location, and the length of the press.
In Idle mode, while in a menu or page:
A brief press takes you back to the Home Screen
A longer press locks the device.
While in a voice call:
A brief press hangs up the current call.
A longer press locks the device.
While in a data call:
A brief press puts the device into a dormant
mode. (A second press will end the data call.)
A longer press locks the device.
Completing a Hard Reset of the Device
WARNING This reset will delete any installed applications
or personal information saved to the device.
Contacts stored on the SIM card will not be
deleted.
20 Section 2A. Device Basics
1. Remove the storage card from the device, if one is
present.
Note A hard reset will erase the cipher key used for
encrypting data on the microSD card. Please ensure
that all personal data stored on this card is backed up
to a computer so that it can later be transferred back
to the memory card.
2.
With phone powered off:
Press and hold both the left and right softkeys.
While both softkeys are held down, press and
hold until the unit powers on.
3.
As the device begins to power on, release both
softkeys.
Note Once the phone powers on, you should see an
onscreen alert message (a white screen with blue text).
If you do not see this screen, let the device power up
normally, turn it off again, and then repeat steps 2 and
3.