Samsung SCH-S380ZKATFN - Manual (Page 48)

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Memory Info
The Memory Info menu allows you to view the Total number of Contacts
that can be stored in your phone memory (up to 1000), the Used number
that you currently have stored and the number remaining Free for
Contacts that can be added.
Ⅲ
In standby mode, press Menu ➔ Contacts ➔ Memory Info.