Question about Samsung SGH-U600

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Unlocked assistance my phone is locked when I change sim

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Re: unlocked assistance

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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  • 24 Answers

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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How do i remove SAMSUNG GT-E2222 sim lock password

still have the password when i open my phone please help me gt-e2222 samsung

Dec 29, 2012 | Samsung Chat 222 Plus

1 Answer


It locked to some Network!!So you need to UNLOCK it from the Network lock,find out in which country Network it locked now? get the Network Unlock code for the samsung SGH -I607 Blackjack Model Phone from here Theunlockarena and Unlock it from Network Lock,Then use any GSM Network Sim...

Jun 17, 2011 | Samsung Blackjack SGH-I607 Smartphone

1 Answer

I have a viewty ku990 v1.0 locked on orange, when I put the sim in it come up with inactive usim. I would like to unlock my phone so I use my old o2 sim.

To remove usim locked you need to get unlock code. You can get unlock code at

They can supply unlock code for any LG. Once you have it you just type unlock code via phone keypad.

You MUST have sim card from network phone is locked to to be able to access phone menu! Without such sim card do not purchase unlock code.

Feb 12, 2010 | LG KU990 Viewty

1 Answer

I forgot my privacy lock password on my sidekick 2008

Most likely you have put a pin code on this phone. This code is stored in the SIM card and when you power up the phone it asks for a pin code before you can operate the phone.
In some cases when you enter the wrong pin code too many times the SIM card will lock up. You need to contact the phone service provider for assistance to unlock/remove the pin code.

Nov 22, 2009 | T-Mobile Sidekick II

3 Answers

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

Oct 05, 2009 | AT&T Blackberry Curve 8300 Smartphone

1 Answer

LG U990 USIM locked

1. Insert original sim card and turn phone on.
2. Press telephone icon at bottom of screen to bring up the phone keypad.
3. Enter 2945#*990#
4. A menu will pop up, select sim unlock
5. Enter your unlock code and press ok
6. The phone will then reboot and the unlock is complete.
Try this, this may solve your problem.

Aug 16, 2009 | Audiovox SMT5600 Smartphone

1 Answer

Non tmobile sim card?

I assume you are asking about unlocking your phone. If you are a tmobile user than any tmobile sim will work in your phone even if your phone is locked. When a foreign or different compatible sim is inserted your phone will ask for the unlock code if your phone is locked. When you have an unlocked phone it automatically accepts the sim and does not ask for the unlock code since your phone is unlocked.

Jul 05, 2008 | Orange SPV M2000 Pocket PC

2 Answers

Is it locked to Rogers?

If it is set for one service supplier it should work on that sim - I suspect its locked on another supplier - question the seller on ebay - if he is ingenuine you can always leave bad feedback.

Please rate this assistance - I hope it is useful.

Here is a great forum for blackberry - lots of info:

blackberry forum

Please rate my assistance I hope it is useful.

Mar 19, 2008 | RIM BlackBerry 7290

2 Answers


Try with all the code to see whether you can get one to unlock your phone. If all still cannot help then you can only contact Samsung Support for help. I hope these information below at least can give you some hints:

Note try codes which help direct unlock for either SIM Lock or Security Lock first before try other codes

*7465625*746*Code# = Enables SIM lock
#7465625*746*Code# = Disables SIM lock
*2767*2878# (Temporary Unlock)
*7465625*638*00000000*00000000# (Set Code)
#7465625*638*00000000# (Clear Network Lock)
*#7465625# (Verify the network lock is “inactive”)

*2767*3855# - FULL E2P RESET
*2767*2878# - CUSTOM E2P RESET
#*7337# - UNLOCK
*2767*688# - UNLOCK
*#0523# - CONTRAST
*#9998*523# - CONTRAST
*#8999*8378# - Service Menu (X100)

First with different carrier SIM in phone at WRONG CARD screen ENTER on the keypad
*2767*3855# (wait 10-15 seconds) phone will reboot(restart)
When phone completes reboot ENTER
AND THEN *#7465625# to check the locks....all locks are inactive...these are all the locks...
network lock - inactive
subset lock - inactive
sp lock - inactive
cp lock - inactive
sim lock - inactive
activa lock - inactive
phone lock - inactive
auto network - inactive
auto subset lock - inactive
auto sp lock - inactive
auto cp lock - inactive

Good Luck

Feb 22, 2008 | Samsung SGH-U600

3 Answers

Unlock code

SIM Cards and Unlocking your Phone What is a SIM?

Subscriber Identity Module (SIM): A smart card containing the telephone number of the customer, encoded network identification details such as: Call Forwarding, Caller ID, etc., the PIN, and other user data such as the phone book. T-Mobile customers can move their SIM card from any T-Mobile branded phone to any other T-Mobile branded phone without the need to contact Customer Service to activate the new phone. Your rate plan and phone number will follow your SIM to the new phone.

SIM Error Messages:

  • Invalid SIM: This error means that the SIM you have inserted into your phone is either inactive or is not compatible with our service. You may purchase a new SIM card from a T-Mobile retail location. Locate a T-Mobile retail store near you.
  • Insert SIM: Your SIM is either not inserted in your phone or is inserted improperly. Please remove and re-insert your SIM card. If you continue to receive this error message, your SIM card or phone may be defective. You may take your phone and SIM to a T-Mobile retail store for further assistance and a free SIM card replacement if necessary. Locate a T-Mobile retail store near you.
  • Unregistered SIM: This error may occur if your SIM card is not fully activated or if the SIM card registered to your account is different than the SIM you have in your phone. For assistance with this issue, please contact Customer Service.
  • SIM Not Ready: This error occurs when you have just powered your phone and is due to the phone not being fully initialized. Please wait a few moments before accessing your phonebook or placing a call.
  • OTA OK: This message is displayed when your phone receives a network update, phonebook download, or an Over-The-Air t-zones or Picture Messaging configuration. NOTE: These messages are free of charge and will not be billed to your account or pulled from any text message bucket.
  • Enter PUK: These errors can occur if you have entered your SIM PIN three times incorrectly. If you receive this error message, please contact Customer Service for a PIN Unblocking Key (PUK) to restore access to your phone.
  • Check card, Card Blocked See Supplier, Blocked, SIM Blocked, or Contact Card/Service Provider: These errors may occur if you have entered your PUK ten times incorrectly. If these errors display your SIM is unusable and you will need to purchase a new SIM card. You may purchase a new SIM card from a T-Mobile retail location. Locate a T-Mobile retail store near you.

A SIM PIN can be used to prevent access to your phone. When enabled, your phone will prompt you for the SIM PIN when the phone is powered on. Entering the wrong PIN will prevent you from making or receiving calls. SIM PINs are different from a Security Code that your phone may use to secure other phone functions. Please check your phone’s manual for further security details.

T-Mobile SIM PIN numbers are set to default values before purchase. If you change your SIM PIN, it is recommended that you keep record of the new PIN in a safe location. T-Mobile cannot retrieve a lost or forgotten SIM PINs.
  • SIM PIN1: 1234
  • SIM PIN2: 5678 (Only available on select phones)
SIM Unlock:

T-Mobile branded phones operating on the T-Mobile network may only use T-Mobile SIM cards. To use a T-Mobile branded phone on another wireless carrier's network with a non-T-Mobile SIM card, you must first request a "SIM Unlock" code from T-Mobile. Conversely, if you have a phone from another North American wireless carrier, you may need to request a "SIM Unlock" code from that carrier before being able to use a T-Mobile SIM card on the T-Mobile network.

SIM Unlock Requests:

T-Mobile customers must meet the following eligibility requirements before contacting Customer Service to request your SIM Unlock code.

The following restrictions apply to all account types:
  • T-Mobile can provide SIM Unlock Codes only for handsets sold by T-Mobile USA, with the exception of Danger Sidekick devices. T-Mobile can obtain SIM Unlock Codes for companies acquired by t-Mobile USA (VoiceStream, Aerial, Omnipoint, SOL, Digiph, PCS One, and Powertel).
  • SIM Unlock Codes will only be provided after your account has been active for 90 days. Only one unlock code may be provided per customer every 90 days.
  • No SIM Unlock Codes will be provided within the 14-Day Buyer's Remorse period. Customers who purchase phones in CA California or via are granted a 30-Day Buyer's Remorse Period.
  • SIM Unlock Codes are not always available from the Manufacturer. However, T-Mobile will make a dedicated effort to obtain the SIM Unlock code. Note: Other restrictions may apply depending on account type.

Jan 10, 2008 | T-Mobile Wing™ Smartphone

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