Samsung SCH-R270ZKAMTR - Manual (Page 116)

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Erase All Contacts
The Erase All Contacts option deletes all entries from the
Contacts list.
Restriction
The Restriction option settings let you Allow All Calls/Allow
calls only to/from your Contacts/Allow No Calls (Incoming and
Outgoing), Allow All/None SMS (Text) Messages, Allow All/
None MMS (Picture) Messages, and/or Allow All/Allow None
Data calls.
Note: All default restriction settings are Allow All
(unrestricted).
Factory Data Reset
Use Factory data reset to return your phone to its factory
defaults. This setting erases all data from your phone,
including system and application data and settings, and
downloaded applications. It will not erase current system
software and pre-installed applications, or files stored on an
optional installed memory card, such as music or photos.
Caution! Before selecting Factory Data Reset, contact your
Wireless Carrier. Invoking Factory Data Reset may
erase settings made by your Wireless Carrier from
your phone, resulting in loss of service.