Samsung SGH-T999ZAATMB - Manual (Page 13)

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IMPORTANT: Verify that the battery is installed prior to connecting the wall
charger. If both the wall charger is connected and the battery
is not installed, the handset will power cycle continuously and
prevent proper operation. Failure to unplug the wall charger
before you remove the battery, can cause the device to become
damaged.
Turning Your Device On and Off
1. To turn ON, press and hold the Power/Lock key.
2. To turn OFF, press and hold Power/Lock key and follow the
prompts.
Locking and Unlocking Screen
1. To Lock, press the Power/Lock key.
2. To Unlock, press the Power/Lock key then swipe your finger
across the screen.
Initial Device Configuration
1. Select a language and tap Next or tap Accessibility if you are
visually impaired or hard of hearing.
2. Follow the on-screen instruction to complete the set up
process.
NOTE: If you do not set up or log into your Gmail™ account during this
process, you can later access Gmail from within the Applications page.