Samsung SCH-R915ZKACRI - Manual (Page 114)

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Removing an account
Important!: Removing an account also deletes all of its messages, contacts
and other data from the phone.
1. From the Settings menu, touch Accounts & sync.
2. Touch an account to display its settings.
3. Touch Remove account, then touch Remove at the prompt to
remove the account and delete all its messages, contacts
and other data.
Privacy
Use Privacy settings to manage use of personal information by
your phone.
Personal Data
Factory data reset
Use Factory data reset to return your phone to its factory
defaults. This setting erases all data from your phone, including
your Google or other email account settings, system and
application data and settings, and downloaded applications. It
will not erase current system software and bundled applications,
or files stored on an optional installed memory card, such as
music or photos.
1. From the Settings menu, touch Privacy.
2. Touch Factory data reset, then follow the prompts to
perform the reset.