Question about Samsung SGH-X830 Cellular Phone

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U600 unable to dial number

Hi there
i am unable to dial a certain number, it says "Change by SIM" and then automatically redirects to me Messages?!
i tried to delete the number completely from my SIM or phone memory and jus dial normally, but everytime that comes up, i can't even call that number.

i must've pressed something accidently?
please help.

thanks.

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2 Answers

Doesnt work =(

Posted on Mar 28, 2008

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Typed *2767*3855# this should manu reset the entire main-board.

Posted on Mar 27, 2008

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How to unlock samsung u600


To Unlock Samsung U600 from network lock use unlock code..Visit the site
Superunlockcodes.com get the code at low cost and unlock it easily.You can enter the unlock code in the Mobile using the unlocking instructions below:
Samsung U600 Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Samsung U600 mobile phones. If you enter over a certain amount of wrong unlock codes on your Samsung U600 mobile phone, your phone may get hard locked and sometimes become unusable.
Method 1:

1 - Switch ON your Samsung U600 with a NOT ACCEPTED SIM Card.
2 - Samsung U600 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung U600 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung U600 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung U600.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung U600 is locked to.
CODE: Its the unique Unlock Code for your Samsung U600.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung U600.
Each Samsung U600 mobile phone has an unique unlock code. You can buy the unique unlock code for your Samsung U600 mobile phone using the form above.

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What does Fixed Dialling Numbers mean?


Fixed Dialing Numbers or FDN list is a SIM card based security feature which allows the phone to be "locked" so that it can only dial certain numbers, or numbers with certain prefixes.

A PIN2 code (numeric password) protects the allowed list of numbers from being changed by any person who does not know the PIN2 code.

In FDN mode, your device will restrict outgoing calls, except for the numbers stored in the FDN list.

To activate FDN mode,
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3.) Select FDN list and add contacts to be used in FDN mode.

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Please, use another Sim with the phone, if the Sim can send messages, definitely sounds like an error in the SMS centre number. You can change this by following the below steps:


1. Open your dialer and dial: *#*#4636#*#*.
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Messages When You Turn on the Phone
  • When turning on your phone you may find a message requiring you to take a certain action before you can use the phone. If the message says "INSERT SIM," make sure the SIM card is installed in the phone or that it hasn't become loose. The SIM card is located in the battery compartment. Remove the battery cover and the battery. The SIM card should be located near the bottom of the phone under the metal hinge. Insert or secure the SIM card with the contacts facing down, reinsert the battery and batter cover, and turn your phone on again.

    If the message reads "PHONE LOCK," the SGH U600's automatic locking function is enabled. Enter the phone's password to unlock the phone.

    When using the phone for the first time, you will be prompted to enter a PIN. The PIN is given with the SIM card for your phone. Enter the PIN number exactly as given. You may also have the "PIN Check" feature enabled on your phone, which will require you to enter the PIN every time the phone is powered on. You can turn off "PIN Check" in the "Settings" menu.

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  • Read more: Samsung SGH U600 Troubleshooting ' eHow.com http://www.ehow.com/way_5408527_samsung-sgh-u600-troubleshooting.html#ixzz11rVbifG3

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    Mar 27, 2008 | Samsung SGH-X830 Cellular Phone

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