I have a Smasung SGH-T749 Locked to T-Mobile. I would like to cahnge carriers to Verizon. I need to unlock this phone I have tried various codes but no luck. Please Help.

What's your current locked carrier?
You can get your unlock code from your service provider or else try to buy an unlock code from any one of the online unlocking service provider like SimpleUnlocking.com Here you can unlock your phone at low cost.

Hi code is the best solution to unlock your samsung SGH-T749 highlight mobile from network lock .You can purchase code from sites like TheUnlockSpot.com they are rendering unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone ...

Hi to get carrier unlock code visit Wickedunlock.com here they ask you the network carrier name to which your Samsung SGH-I917 mobile is locked and the IMEI number of your mobile .Then they render you code to unlock your mobile.

try online...

If you wanna unlock your sgh-t749 mobile , I would recommend you use unlocking codes as it is one of the safest way , Unlocking via codes is the best method for unlocking the mobile . using the unlock code specified in this site mobile-unlocker proceed unlocking your mobile . They are reliable and provide good customer support service.

To unlock it get the unlock code and Instructions at
Onlinegsmunlock.com and unlock it...

Samsung SGH-T749 Highlight Unlocking Instructions Warning : Do not enter any wrong unlock codes on your Samsung SGH-T749 Highlight mobile phones. If you enter over a certain amount of wrong unlock codes on your Samsung SGH-T749 Highlight mobile phone, your phone may get hard locked and sometimes become unusable.
Method 1:

1 - Switch ON your Samsung SGH-T749 Highlight with a NOT ACCEPTED SIM Card.
2 - Samsung SGH-T749 Highlight will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung SGH-T749 Highlight shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung SGH-T749 Highlight with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung SGH-T749 Highlight.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung SGH-T749 Highlight is locked to.
CODE: Its the unique Unlock Code for your Samsung SGH-T749 Highlight.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung SGH-T749 Highlight.

You can get a free unlock code for your phone by downloading unlocking software or calling your phone carrier's support. Either way you will need your Samsung Highlight T749?s IMEI number. You can get this IMEI number by typing *#06#.Once you have your Samsung Highlight's unlock code, you can begin the unlocking process.
Unlock Samsung Highlight T7491. Power up your Samsung T749 with your unaccepted SIM card in.
2. Now, if your phone prompts for an unlock code, go ahead an enter it. However if no prompt is displayed, then type: #7465625*638*CODE#. Where CODE = your 8-digit unlock code.
3. Phone will say "Network Unlocked" and may automatically reboot.
Now you can use your Samsung Hightlight T749 on any phone network. Enjoy!
Note: The free unlock instructions provided on this site only work with GSM or SIM card versions of the Samsung Highlight T749. As always there may be already unlocked versions of this mobile phone, but generally cost a lot more then unlocking it yourself.

As a warning entering 3 unnacpted unlock codes could permanently lock your phone

You can get the Unlock code here
http://www.prounlocking.com/samsung-sgh-t749-highlight/rs8wp9/ and Unlock it...........

http://www.mobileslate.com/blog/2009/11/22/how-to-unlock-samsung-sgh-t749-highlight/

Above is your manual, click on it and the main page halfway down is your code

hope its ok for you