Samsung SGH-t509s - Manual (Page 118)

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ion 8
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2. Press the Reset soft key.
3. You will be prompted with Reset settings?. Press the
Yes soft key.
4. Enter the 4- to 8-digit password and press the OK soft
key or the key. You will receive a reset confirmation
message.
The password is preset to “00000000.” To change this
password, see "Change password" on page 111.