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GSM639


General

-   Dual band 850 / 1900 or 900 / 1800

-   DB9 serial port for PC tool and GRPS



Call Features

-   CLIP / CLIR, DTMF caller ID and error message display
-   Call diversion / call waiting / call barring
-   Enter and change PIN

-   Voice mail

-   Local call limitation
-   Reject incoming call and call back function
-   Outgoing call duration limitation
-   Phone lock / SIM card lock / Network lock


Physical Features
-   Speaker volume adjustable
-   Easy upgrade with the update port / call back
-   Predefined outgoing / incoming calls restriction
-   DC jack provided for connecting external power

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