Question about Samsung SGH-C425 Cellular Phone

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Pin code request when turning phone on

Hi my boyfriend baught me a 2nd hand samsung 450 and when i put my simcard in it requests pin code and i do not have a pin code on my simcard can you help me with a unlock pincode from samsung or something thanks
PHONE TYPE IS SGH-C450 How do you unlock the SGH-C450?? I found one walk through on here but part 4 is in another language (and only part four frustratingly enough) so i was unable to use it.

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  • annoyedatcel Dec 26, 2008

    This isn't actually my problem... i just commented on it and for some reason it just posted the other persons problem. Mine's the same phone and brand new. Can't unlock it. Someone previously responded to this but part 4 was in another language so i was unable to use it... Anyone know how to unlock this phone using only a code?? Just it was a christmas pressie and i don't want the person who gave it to me to be upset.



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Turn it off and get out the sim or get the box that it came in and then thell be a card ia credit card itll tell you the PIN. dont know how to unlock im trying to figure that out to. type in the pin and go to the langue settings and select english.

Posted on Feb 17, 2010


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If you for got the pin number of your phone most probably it would lead to PUK lock if you attempt to put pin number at least 3 times.
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Please refer below for some information:
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  • PUK Code is the code requested by your sim card whenever you have enter wrong password for more than three times. The PUK code can be only provided by your supplier.

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PUK code (0 left) - Need Code

Hi,it is your sim card which is blocked as you have entered the pin code wrongly 3 times,

It is easily solved by contacting the network provider of your sim and requesting the PUK code for which there should be no charge,

Some networks will have this service available online if your check on their website,you put in your mobile phone number and it will generate the PUK code,

If you are unable to find it on their site you can ring them and they wll be able to assist you with it,

Do not try guessing random codes as after failed attempts at inputting the wrong PUK your simcard will be permanently blocked and need replaced,

Just noticing you say in your question (0 left),is this referring to no attempts left? Have you already tried 10 times to guess the PUK?

If this is the case your simcard is now useless,but your phone is fine,it will work with another simcard,

If it is important that you have the same mobile number you will have to request a new simcard from your provider and they may charge for this

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2 Answers

Pin code request when turning phone on

hey everyone.

i have read a couple of threads i have found on the internet and i have tested this on my samsung sgh-c450 locked to telstra. no computer is needed (or cable). i hope this helps anyone with a samsung. WARNING: ALL CONTACTS AND OTHER SETTINGS MAY BE LOST DURING THIS PROCESS!!!

Before you start, make sure the battery is charged and all security codes or PIN codes or watever are disabled so we dont have any code prompts interfering with this method.

1. Turn off the mobile phone.
2. Insert a "Non-accepted" SIM card (sim card that wont work) half way in so that when you turn on the phone, it still says "Insert SIM".
3. Turn on the phone.
4. Aant. Harry----- punt 4 is vervallen ivm met het verwijderen van de emei-code.
5. Once reset has completed, the phone will still say "Insert SIM". This is where you need to push the sim card all the way in. You can use a paperclip or a tiny object to push it in if you have difficulty. IT IS IMPORTANT THAT THE PHONE REMAINS ON AT THIS STAGE (TRY NOT TO LET BATTERY FALL OUT) IF BATTERY FALLS OUT, DO NOT PANIC, JUST START FROM STEP 2 AGAIN.
6. Enter the following code and wait patiently for phone to reset:


7. After reset is completed, SIM should work and also the reception. Don't get excited, its not unlocked yet.
8. Now we want to make it permanent. First check what locks need to be deactivated with the following code:


Aantekening Harry: Om de codes in te voeren moet je een keer op de rode toets (naast C) drukken, zodat je in het beginscherm komt. Dan kun je codes intoetsen. Dus geen codes intoetsen als je in het keuzemenu zit.
If Network Lock is "Active", put in the following code:

Message should be "Network Lock has been personalised" or similar.

Message should be "Network Lock deactivated" or similar.

If Subset Lock is "Active", put in the following code:

Message should be "Subset Lock has been personalised" or similar.

Message should be "Subset Lock deactivated" or similar.

If SP Lock is "Active", put in the following code:

Message should be "SP Lock has been personalised" or similar.

Message should be "SP Lock deactivated" or similar.

If CP Lock is "Active", put in the following code:

Message should be "CP Lock has been personalised" or similar.

Message should be "CP Lock deactivated" or similar.

If SIM Lock is "Active", put in the following code:

Message should be "SIM Lock has been personalised" or similar.

Message should be "SIM Lock deactivated" or similar.


"a)" is the common one that usually is the only one need to be done but if other locks are active, i think its best to disable them now while you have the chance.

Now you have unlocked your phone!

Tested on:

Please test this!

Thank You.

Sep 16, 2008 | Samsung Blackjack SGH-I607 Smartphone

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