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Do you travel a lot and want to use your phone in another country? Or are you bored with your current service and want to change to a new carrier before your contract expires? Jailbreaking Samsung phones allows us to use another carrier’s SIM and connect to that mobile network. You’ll need to contact your carrier to unlock your phone, but there’s still a chance that your contract hasn’t expired and they don’t support it. In this case, you can consider using a third-party service or manual unlocking if the phone model is suitable. Let’s see step 1 below.
Steps
Contact the carrier
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Call your carrier and ask about the unlock policy. Most carriers will agree to unlock it after the user has used the phone for a certain amount of time or when the contract expires. If the contract is still in effect, they will likely ask you to pay an early termination fee to unlock the phone.
- They can unlock it early if you explain that you’re going abroad on business and need to use your phone.
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Contact the carrier you intend to change. Many carriers are happy to unlock your phone if you’re switching from one of their competitors. Call the carrier you want to exchange and try to negotiate if you can use their service to help unlock your phone.
- Make sure your new service provider uses the same type of network that your phone supports. In the US, GSM (AT&T, T-Mobile) and CDMA (Sprint, Verizon) are the two main types of networks. In Vietnam, all major carriers (including MobiFone, VinaPhone, Viettel, VietnamMobile) operate GSM networks.
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Find the code for your Samsung phone. If the phone has been out for a while, the unlock code is generally provided by the manufacturer. Look for the phone model online to see if there is a code. With newer phone models, it’s almost impossible to find the code.
By paid unlocking service
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Find your phone’s IMEI/MEID number. You need to provide this unique identifier when requesting the unlock code. Open the calling app and use the keypad to dial *# 06# . A 15-digit code will appear on the screen.
- Make a note of this code so you can easily re-enter it later.
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Find a reputable unlocking service. There are many companies out there that claim to be able to unlock phones for a fee. Because you’re going to pay to unlock your phone, make sure the unlocking service is well-reviewed and has a solid guarantee.
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Request code. You will be asked to provide your IMEI/MEID number along with contact and payment information. The amount to be paid will depend on the phone model and code retrieval speed.
- It can take up to a few days to retrieve the code as these companies often rely on a relationship with the carrier.
- When you enter your phone’s information into the service, you need to make sure that these are 100% correct in order to receive a code that works with the device again.
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Insert a new SIM card. After receiving the unlock code, power off your phone and take out your old carrier’s SIM card. Then insert the new carrier’s SIM. The SIM tray is usually located behind the battery or on the side of the device.
- See more instructions online on how to find and remove the SIM card.
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Power on the phone. You will be asked to enter a code to connect your phone to the mobile network. Enter the code you received from the unlocking service.
- You may have to be in the coverage area of the new network for the code to appear. This process will vary depending on the device.
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Check if the phone is connected. If the code entered is correct, the phone will connect to the new mobile network. If you can’t connect to the new network yet, make sure you’re in an area of coverage, then contact your carrier to see if your phone is properly unlocked.
Unlock Samsung Galaxy S3 and Note 2 manually
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You need to make sure your phone is up to date. Phones need to run Android 4.1.1 or higher operating system to apply this method. You can check your device’s version by opening Settings, scrolling to the bottom, and selecting About Device. The version will appear below the Android Version heading.
- To update your phone, open Settings and scroll down to About Device. On the next menu, select System Updates and click Check for Updates. Your phone will search for available updates, and if they are available, the system will automatically download and install them.
- This method is not applicable to devices with custom ROM pre-installed.
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Open the calling app. You need to enter the code into the dialer to open the Service menu. Once the dialer opens, enter the following code:
*#197328640#
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Select “[1] UMTS”. After the code is entered, the phone automatically opens the ServiceMode menu. Here, select “[1] UMTS”.
- Tap the option in the on-screen menu. If you make a mistake, you can press the Menu button on your phone and select Back.
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Open the Debug menu. On the UTMS menu, select “[1] DEBUG SCREEN” (Error Troubleshooting Screen). On the next Debug menu, select “[8] PHONE CONTROL”. Finally, select [6] NETWORK LOCK from the Phone Contrp menu.
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Select “[3] Perso SHA256 Off”. Wait about 30 seconds, then press the Menu button and select Back. Click on “[4] NW Lock NV Data INITIALLIZ”.
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Wait and reboot. After selecting “[4] NW Lock NV Data INITIALLIZ”, wait about 1 minute and then restart the phone. There will be no confirmation message that the process was successful so you need to check by inserting a new SIM card. If your phone doesn’t ask for an unlock code, you’ve succeeded. [1] X Research Source
- If this method doesn’t work on your phone, contact your carrier about the unlock issue or pay an unlocking service fee to get the code.
Unlock Samsung Galaxy S4 Manually
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You need to make sure that your phone is suitable for this method. This method only works for AT&T and T-Mobile’s Galaxy S4 in the US. In addition, the device must be a pure phone; Android with custom ROM will not be compatible.
- This method is unlikely to work with CDMA phones like those from Sprint and Verizon in the US.
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Open the calling app. You need to enter the code into the dialer to open the Service menu. Once the dialer opens, enter the following code:
*#27663368378#
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Select “[1] UMTS”. After you enter the code, your phone will automatically open the ServiceMode menu. Here, select “[1] UMTS”.
- Tap the on-screen menu option. If you choose the wrong one, you can press the Menu button on your phone and then select Back.
- Service Mode is the phone’s very powerful diagnostic menu. You should only change specific settings as shown in this guide. Any other changes may cause the phone to become inactive.
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Open the Debug menu. On the UTMS menu, select “[1] DEBUG SCREEN”. Next in the Debug screen, select “[6] PHONE CONTROL”. Finally, click “[6] NETWORK LOCK” on the Phone Contrp menu.
Select “[3] Perso SHA256 Off”. After you have made your selection, the screen will display this content:
SHA256_ENABLED_FLAG[1]SHA256_OFF => SHA256_ON
Click on the first line. After you tap the “SHA256_ENABLED_FLAG[1]” option, the phone will show:
MENU NOT EXISTPRESS BACK KEY
- To continue, press the Menu button on your phone and select Back.
Make sure the setting is changed appropriately. When you back up, the message in step 4 will display as:
SHA256_ENABLED_FLAG[0]SHA256_OFF => Not Change
Return to the UMTS menu. Press the Menu button and select Back four times until you return to the UMTS main menu. Then select “[6] COMMON” and then tap “[6] NV REBUILD”. The screen will display the following message:
Gpden-Backup existYou can Restore Cal/NV
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Restore backup. Select “[4] Restore Back-up” on the NV REBUILD menu. The phone will reboot by itself. Now that the phone is unlocked, you can insert your new carrier’s SIM card. If the machine does not ask to enter the unlock code, the process was successful. Check if you can connect to the mobile network. [2] X Research Source
- If this method doesn’t work on your phone, contact your carrier about the unlock issue or pay an unlocking service fee to get the code.
X
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 13 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 3,799 times.
Do you travel a lot and want to use your phone in another country? Or are you bored with your current service and want to change to a new carrier before your contract expires? Jailbreaking Samsung phones allows us to use another carrier’s SIM and connect to that mobile network. You’ll need to contact your carrier to unlock your phone, but there’s still a chance that your contract hasn’t expired and they don’t support it. In this case, you can consider using a third-party service or manual unlocking if the phone model is suitable. Let’s see step 1 below.
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