Samsung SGH-X640 Manual De Usuario

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must enter the SIM lock code to use a different SIM 

card.
FDN mode

If supported by your SIM card, Fixed Dialing Number 

(FDN) mode restricts your outgoing calls to a limited 

set of phone numbers. When this feature is enabled, 

you can make calls only to phone numbers stored in 

Phonebook. To use this feature, you must enter your 

PIN2.
Change PIN2

If supported by your SIM card, the Change PIN2 

feature changes your current PIN2.

Use this menu to set the phone to make up to ten 

attempts to redial a phone number after an 

unsuccessful call.

Use this menu to remove extraneous noise and 

increase call quality to allow the other person on the 

phone can hear you clearly even if you are in a noisy 

place.

Use this menu to set whether to answer incoming calls 

by opening the phone.

Use this menu to set how the Volume keys act when a 

call comes in.
• Reject: you can reject calls by holding down the 

keys.

• Silence: you can mute the ringer by holding down 

the keys.

Use this menu to set whether to answer incoming calls 

by pressing any keys, except [

].