Question about Samsung SGH-U600

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Unlocked assistance my phone is locked when I change sim

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  • fadstar Nov 14, 2007

    when i put optus sin card it wont work, when there is voda it works, and its asking for a code.

  • kezpx Jan 09, 2008

    put sim card into my handset and it asked for pin so i put my pin in all came on right the flixed of came back on saying phone locked return for service



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Is the phone asking for unlock code or is it asking you to enter special code because these are two different types of lock

Posted on Nov 03, 2007


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Posted on Jan 02, 2017

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SOURCE: I bought a pantech c520 AT&T unlocked phone

i think ur phone is not unlocked completely, try codes from to unlock your phone completely

Posted on Aug 10, 2010

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2 Answers

I want to change sim card

is it a post paid plan or a prepaid sim?if it's the former, i suggest talking to your service provider about it.if it's the latter, just a buy a new one from any retailer. ^_^

Mar 12, 2012 | Cell Phones

2 Answers

Sony ericsson w302 lock sye sim card lock i dont no problem.

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My name is Ben and I'm your guru, i.e., mentor, an influential teacher or popular expert: a management guru. - origin from Sanskrit, 'weighty, grave' for today.

PUK Codes

A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code from AT&T to unlock your SIM card.

Since I don't know the name of you carrier, I'm using AT&T as an example. Most carriers use the same methodology though the wording may be different.

You can obtain your phone's PUK code from AT&T in one of these ways:

• Log in to myAT&T online
• Use our Technical Support Chat.
• Contact Customer Care

To get your phone's PUK code online:

? Log in to myAT&T.
? From the myAT&T tab at the top of the page, hover over the Wireless link and select Phone/Device under the My Wireless Service heading.
? From the My Phone/Device screen, select the Unblock SIM Card link under the My Make & Model heading.
? The Unblock SIM screen will display your PUK code and will give you instructions for unblocking your SIM Card.

Once you receive your PUK code, you will need to enter it into your phone to set a new PIN code.

Note: If you enter the wrong PUK code 10 times in a row, your SIM card will be invalidated, and you will need to purchase a new SIM Card. The phone will display the following error: "PUK blocked call operator."

You can also do it without any assistance from anyone, However, be sure to read the following carefully because there are pitfalls.

Although most people remember their primary SIM PIN code, those other codes - used for various verification purposes - are never to be found when needed. Below we've included a set of short codes which, when entered on a handset's standby screen, will let you easily change PIN and PUK (short for Pin Unlock Code) codes - but keep in mind, they may not work with all handsets and mobile operators. If you are interested in a software fix, click on the following link: Universal SIM Lock Remover

More importantly, when changing ones PUK codes there'll be no help to get from the mobile operator if the new codes are forgotten, so make sure to write any changes down alongside the old PUK codes. Also, please note that the codes should be entered without the spaces shown below.

Change SIM Card PIN
** 04 * old PIN * new PIN * new PIN #

Change SIM Card PIN 2 (Write down the new code)
** 042 * old PIN * new PIN * new PIN #

Change SIM Card PUK (Write down the new code)
** 05 * old PUK * new PUK * new PUK #

Change SIM Card PUK 2 (Write down the new code)
** 052 * old PUK * new PUK * new PUK #

Display Handset IMEI
*# 06 #

This was wordy but hopefully it helped you.


*# 06 #

This was wordy but hopefully it helped you.


Aug 17, 2011 | Sony Ericsson W302 Silver +512MB by Fedex...

2 Answers


Contact your cellular service provider and request Tech Support assistance. They will give you your PUC code.

Do not try to guess the code. Repeatedly entering the wrong code will damage your SIM and your phone.

Feb 01, 2011 | Sony Ericsson K770i Purple 3G Camera...

2 Answers

I have a Samsung SGH-A551 phone which can only accept Telstra sim and when I insert another sim (PNG B mobile sim) "Phone Freeze SIM unavailable" appears on screen. Could you please assist if possible. ...

it may be due to network lock, contact service provider if it locked , you can get unlock codes here
you need to specify the country and network provider,

check, if your model is available in the list

Sep 27, 2010 | Samsung SYNC SGH-A707 Cellular Phone

2 Answers

Please give sim lock password for samsung sgh-x510


Sim card lock can be unlocked, but only by the service provider of the particular kind of line you are using at the moment.

So you can contact the service provider of your phone to assist you with unlocking your Sim card and it is free.

Have a lovely day.

Mar 15, 2010 | Samsung SGH-X510 Cellular Phone

2 Answers

I changed my security code but forgot it

If it is the unlock code you need to get into the phone, then this code is stored on the SIM card. If you try too many times to unlock the phone it may lock the SIM card permanently. You need to contact your phone service provider for assistance.

Nov 22, 2009 | Nokia Cell Phones

2 Answers

Need to unlock my tracfone to use another sim card

If the SIM card is from TracFone, they will assist you.

If it's from another provider, you cannot unlock the TracFone.

Sep 25, 2009 | Motorola Mobility TracFone w175 PayAsYouGo...

6 Answers

Lost Nokia 1600 phone lock code

SIM pin code:
This is a pin code that locks the sim card until you enter the correct code. This protects your account, even
if your sim is put into another handset. To reset it, you need the PUK code:
Pin Unlock Code (PUK)
If you miss key (or forget) your SIM pin code, and enter the wrong one 3-5 times in a row, the SIM will lock up, and you’ll need to enter the PUK unlock code to release it. You should ask your Network Service Provider for this code when you need it. Don’t try to guess it, because after a few wrong guesses, the SIM card will be permanently disabled.
Phone Security Code:
This locks the handset, as opposed to the sim card. You can also set some handsets to only accept a “new” sim if the phone security code is entered. To reset it, you need the Master code code:
Master Reset Code
Sometimes known as the Master Code, this allows you to unlock a handset if you have entered the Security Code wrongly too many times.

The default security code for Nokia is 12345
I need the IMEI (International Mobile Equipment Identity) number. Type this code in your phone to get it: *#06# you can also find it beneath the battery.
Then I’ll give you the Master code to reset your Security code.

"Confucius he say: He who sits on tack is better off."

Apr 18, 2008 | Nokia 1600 Cellular Phone

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