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GalaxSim Unlock

Sim unlock your Android Samsung Galaxy device.

Easily sim unlock your Samsung Galaxy family smartphone/tablet (S, S2, S3, some S4, Tab, Tab2, Note, Note2 and variants) so you can use any other network operator. No need for unlock code on most devices: as simple as one button click, and you can change your carrier sim card !

video courtesy of Explore Gadgets

Main functions

  • Sim Unlock your phone in-app payment
  • Backup and Restore EFS data, keep it safe on your email or Drive account (free)
  • Get detailed information about your nv/lock state


  • Unsimlock / unbrand your phone
  • Persists even after reset / flash / wipe / unroot
  • Supports any rooted rom (Samsung stock, aosp, aokp, cm9, cm10...)
  • Supports international GS4 GT-I9500, GS3 GT-I9300, Note2 GT-N7100
  • Supports other Galaxy family devices (S, S2, Tab, Note and their variants)
  • Supports devices previously unlocked with "voodoo unlock" or "galaxy s unlock"
  • Detects errors like lost imei / serial in nv_data caused by third party apps
  • Gives detailed information about current locks status (locked, unlocked or "partially locked")
  • Automatic and manual efs backup (should guarantee a safe use), restore it on demand
  • Supports more Galaxy devices soon

Easy to use

  • Be sure your rom is rooted (tutorial links included for major devices)
  • Click on "unlock" button
  • Reboot


  • Due to the large variety of models and lock systems, not all devices can be unlocked. We're working on it to improve support
  • Some supported devices have been recently updated to prevent unlocking. Once again we don't abandon you, give us time !
  • This app is not affiliated in any way with Samsung.
  • Trademarks and model names listed above are © copyrighted by their respective owners.
  • Contact us if you want to help translating to your language.

More than your typical Unlock and Relock application

“It will unlock your device and make sure it remains that way, no matter what custom ROMs you may try to flash.
If you have a GSM Galaxy S, Galaxy S II, or Galaxy S III and you need it SIM unlocked, this is —by far— the best method available currently to get that done.”

It literally took me 5 minutes

“I won’t lie and say that this is difficult from an end user perspective, because the truth is [...] it literally took me 5 minutes.
I will say that I am hugely indebted to the developers over there as this wasn’t exactly the easiest thing to pull off, the guys over there work extremely hard and deserve a lot of credit.”

Absolutely Immense

“T-Mobile wanted £25 and told me it could take a month to get the unlock code. Took me literally 2 minutes to root my phone, installed this app, paid them £2.50 and had a foreign simcard working seconds later. Greatest of thanks; really impressed :)”
“Does exactly what it says on the tin. It's never failed me. First class application.”


  1. What is sim unlock (or unsimlock) ?
    Many carriers sell devices that are locked on their own network. These devices can't be used with another carrier's sim card. Unsimlocking will remove this restriction so that you can freely use your device. Please note that a device that's been locked by a carrier because it's been reported lost/stolen won't be unlocked with this app (this kind of unlock is illegal).
  2. How can I know it's locked or not ?
    You can easily see if your device is simlocked by using another carrier's sim card. If it's simlocked, it will request a "sim (or network) unlock code" at boot. If no code is requested, then you can assume that your device is not simlocked.
  3. Why would I need to do that ?
    Here are a few reasons :
    • Your contract has ended, you want to change carrier, but your current carrier refuses to give you an unlock code
    • You bought it from second hand and didn't know it was locked
    • You want to go abroad and use a local prepaid sim card
    • You want to lend it to somebody else
    • You refuse the idea of buying a device and yet not being able to use it as you want
  4. Is it legal to unsimlock my device ?
    As of now, no country seems to fully forbid sim unlocking. It is however covered by a recent law in US : subsidised handsets bought since 26 january 2013 mustn't be unlocked without the carrier agreement/before the contract has expired (please check the link for details). Thus, it's the end user's responsibility to verify that he won't break his country's laws by using this application. The authors won't be responsible or liable in case of illegal use of this service.

Supported devices

  1. Will it work on my device ?
    GSU should work on most Samsung Galaxy devices (excepted recent Qualcomm/Broadcom based devices, ie GS2/GS3/Note2 LTE/4G). So even if your device is not "officially" supported, as long as the unlock button is displayed, it should work. Don't worry, a backup is made before any modification, so even if something goes wrong, you'll be able to restore your device to its initial state.
  2. My device is not supported, will you add support in next version ?
    We're doing our best to support most Samsung devices. Unfortunately, due to different hardware/technology used, some devices can't be unlocked at this time. So the answer is : "hopefully" (just remember that our time and money to buy new devices are limited).
  3. What are the "officially" supported devices ?
    • Galaxy S : GT-I9000 (Galaxy S), GT-I9000B, GT-I9000M, GT-I9000T, GT-I9003 (Galaxy SL), GT-I9003L, SGH-I896 (Galaxy Captivate), SGH-I897, SGH-T959 (Galaxy Vibrant), SGH-T959D (Galaxy Fascinate), SGH-T959V (Galaxy Vibrant 4G), SGH-T959W, SGH-I997 (Galaxy Infuse), SGH-I997R, SHW-M110S, SC-02B
    • Galaxy S2: GT-I9100 (Galaxy SII), GT-I9100G, GT-I9100M, GT-I9100P, GT-I9100T, GT-I9103 (Galaxy Royal), SGH-I777, SGH-I927 (Galaxy Captivate Glide), SGH-I927R, SGH-S959G, SC-02C, SHW-M250K, SHW-M250L, SHW-M250S
    • Galaxy S3: GT-I9300 (Galaxy SII), GT-I9300T, GT-I9308, SHW-M440S
    • Galaxy S4: GT-I9500 (Galaxy SIV), GT-I9502, GT-I9508, SCH-I959, SM-C101
    • Galaxy Note : GT-N7000, GT-N7000B, GT-N8000, GT-I9220, GT-N5100
    • Galaxy Note2: GT-N7100, GT-N7102, GT-N7108
    • Galaxy Tab : GT-P1000, GT-P1000L, GT-P1000M, GT-P1000N, GT-P1000R, SGH-I987, GT-P6200, GT-P6200L, GT-P6800, GT-P7300, GT-P7500, GT-P7500D, GT-P7500M, GT-P7500R, GT-P7100, SC-01C, SC-02D, SGH-T849, SGH-T859, SGH-T869
    • Galaxy Tab2: GT-P3100, GT-P5100, GT-P5110
    • Galaxy Tab3: GT-P3200, GT-P5200, SM-T311
    • Galaxy Pocket: GT-S5300, GT-S5300B, GT-S5300L, GT-S5302 (Galaxy Pocket Duos), GT-S5302L
    • Galaxy Y: GT-S5360, GT-S5360B, GT-S5360L, GT-S5360T, GT-S5363, GT-S5367, GT-S5368, GT-S5369, GT-S6102 (Galaxy Y Duos), GT-S6102B, GT-B5510 (Galaxy Y Pro), GT-B5510B, GT-B5510L, GT-B5512 (Galaxy Y Pro Duos), GT-B5512B
    • Galaxy Ace: GT-S5830, GT-S5830B, GT-S5830C, GT-S5830D, GT-S5830I, GT-S5830L, GT-S5830M, GT-S5830T, GT-S5830V, GT-S5839I, GT-S6802 (Galaxy Ace Duos), GT-S6802B
    • Galaxy Europa: GT-I5500 (Galaxy 550), GT-I5500L
    • Galaxy Callisto: GT-I5510 (Galaxy 551), GT-I5510L, GT-I5510M
    • Galaxy Mini: GT-S5570, GT-S5570L, GT-S5570I (Galaxy Pop)
    • Galaxy Gio: GT-S5660, GT-S5660L, GT-S5660M, GT-S5660V
    • Galaxy Fit: GT-S5670, GT-S5670L
    • Galaxy Pro: GT-B7510, GT-B7510L
    • Misc: SGH-T499 (Galaxy Dart), SGH-T589 (Galaxy Gravity Smart), Nexus S, GT-I9020A, GT-I9020T, Galaxy Nexus, Galaxy X, GT-I9250, EK-GC100 (Galaxy Camera)
  4. What are the "officially" unsupported devices ?
    • Galaxy S : GT-I9001, GT-I9070
    • Galaxy S2: SGH-T989, SGH-I727, SGH-I757M, GT-I9210, SPH-D710, SCH-I515
    • Galaxy S3: SHV-E210S, SGH-T999, SGH-T999V, SCH-I535, SCH-R530, SPH-L710, SGH-I747, SGH-I747M, SC-06D, GT-I9305, GT-I8190
    • Galaxy Note : SGH-I717, SHV-E160K, SHV-E160L, SHV-E160S, SC-05D
    • Galaxy Note2: GT-N7105, SGH-I317, SGH-T889, SCH-R950, SPH-L900, SC-02E
    • Galaxy Tab : SCH-I905
    • Galaxy Tab2: SCH-I705, SPH-P500
    • Misc: SGH-T759, SGH-T839, SCH-R720


  1. What are the requirements ?
    You need to have a "rooted" device and some free space available on your sdcard/external storage.
  2. I used another app (Voodoo unlock, Galaxy s unlock...) to unlock before using GSU, will it still work as intended ?
  3. What is the setting called "advanced mode" ?
    Until recently, only one unlock method was available in GalaxSim Unlock. Now, on supported devices, other methods might be available. In case your device was not unlocked with the automatic process, checking this option will let you choose other methods if available, that might help unlocking your device.
  4. What are the different unlock methods when "advanced mode" is checked ?
    It depends on the device model and could be the following:
    • Direct unlock : this is the preferred method as it takes a few seconds and is supported by most devices. It directly unlocks your device without computing any unlock code. Depending on the carrier, a few devices however are not fully unlocked with this method (some of which are "hardlocked" devices, as described in the "troubleshooting" section). In that case, flashing a rom was needed to fully unlock the device.
    • Reset Unlock code : use this as a fallback method. If a previous unlock method didn't work, first, click on "restore efs" button to restore lock state, then unlock your device with this method. Once successfully applied, just restart your device with another sim card and when a network unlock code is requested, please enter "00000000". Until now, our tests are 100% successful with this method.
    • Compute Unlock code : this will read/compute the unlock code. Most recent devices don't support this method.
  5. Will I have to unsimlock again after flashing another rom ?
    No, simlock will still be disabled after a flash / reset / wipe / unroot.
  6. Once unsimlocked, should I keep GSU installed ? Will I still need a rooted rom ?
    Please see above answer : your device will remain unlocked whatever you do.
  7. How to restore simlock if I need to send my device for warranty repair ?
    Just hit the "Restore EFS" button If you didn't use any other unlock app before GSU, your sim lock should be back after a reboot.


  1. GSU shows that my device is unlocked, but other carrier sim cards are still refused. Why ?
    Very few carriers (Telcel, Claro...) add a second sim lock level into their roms. As of now, there is no completely reliable method to detect this "hardlock", that's why GSU tells you that your phone is "unlocked" but your experience shows the opposite. Fortunately, there's an easy method to remove this hardlock (100% people having hardlock removed it doing the following) : flash a full unbranded (ie not specific to your carrier) Samsung rom. You can find such roms here (unbranded roms are those which don't have carrier name between parentheses). Please read about the "advanced mode" feature in "unlocking" section, as it might be simpler.
  2. I have an error message saying "unable to connect to network" or "not registered on network". What should I do ?
    Let's start with a good news : if you've just used GalaxSim Unlock, booted your device with another carrier's sim card and it did not ask for a "network unlock code" upon boot, then it means that it's been unlocked successfully.
    Now this issue is related to many different causes. Let's see the most common sorted by fixability :
    • device not restarted: once unlocked or sim card changed, you must restart your device to prevent anomalies.
    • sim card not detected: shutdown your device, remove it, clean it up and insert it back applying a bit of pressure on the contacts.
    • network outage: try switching off 3g by going to Settings -> More Settings -> Mobile Networks -> check GSM/2G Only.
    • wrong carrier selected: go to Settings -> More Settings -> Mobile Networks -> Network Operators -> set "choose automatically" (or select you carrier)
    • wrong network mode selected: go to Settings -> More Settings -> Mobile Networks -> Network Mode -> set appropriate network mode.
      If this menu is not available, you can alternatively dial "*#*#4636#*#*" (as if it was a phone number) -> select phone information -> scroll down -> set the appropriated "preferred network type" (be sure to remember what it was before)
    • wrong radio band selected: dial "*#*#4636#*#*" (as if it was a phone number) -> select phone information -> in contextual menu choose "select radio band" -> set the appropriated band (or automatic)
    • damaged or inappropriate rom/radio: flashing a full rom might fix it.
    • lost serial number: if you don't have any backup of your efs data, there is no solution yet.
    • blacklisted imei: your device has been declared as lost or stolen to your carrier. In that case, nothing can be done (usually, carriers in the same country share their blacklists). If you bought your device from second hand, try to get reimbursed. If you stole it, it might be time to think about a more legal hobby.
    • invalid sim card: either your sim card is invalid/damaged, or it's not working with your specific device
    • hardware failure: your might need to send it back to warranty
  3. I unlocked my device successfully, I can call but I get no data connection (internet, mms...)
    First, be sure that data is enabled : go to Settings -> More Settings -> Mobile Networks -> check "Data enabled" ("National Data Roaming" sometimes needs to be checked too).
    If it's already checked, then your Access Point Names (APN) might be wrong : go to Settings -> More Settings -> Mobile Networks -> Access Point Names -> set the appropriate APN (your carrier should be able to help you regarding the parameters to set, or your can use this app).
  4. I know for sure that my device is unlocked, yet GSU tell me it's locked. What happens ?
    If you click on "details" popup, you'll see that it says "partially unlocked". Depending on the devices (and roms), Samsung stores (and reads) lock information in multiple locations. "partially unlocked" means that at least one of these locations still contains the lock information (meaning if this backup information is restored somehow or a new rom reads it, you device will go back to locked state). If it works for you with another carrier's sim card, you don't need to unlock again, but you might need in the future.
  5. What should I do in case of bug / error / issue / specific question ?
    Please send us a detailed message about your issue so that we can efficiently address your question.
    • What is your exact phone model ?
    • What is your android version ?
    • What is your firmware (or custom rom) ?
    • Which carrier is it locked to ?
    • Did you have an error message (detailed message or screenshot...) ?
    • What did you do exactly ?
    • Could you send us a logcat (made with alogcat from the market for exemple) ?
    • Could you send us your /sdcard/GalaxSimUnlock/efs_backup.tar.gz file so that we can see if something went wrong ?

GalaxSim Unlock messages

  1. Device not rooted
    To unlock your device, GSU needs to modify files present in a restricted area. This is only possible on devices that have been "rooted".
  2. Unable to read nv data
    Your device might not be compatible with GSU. If you want to be sure, just contact the developer.
  3. Invalid IMEI
    You somehow lost your real IMEI (the one written on the box). This is a bad thing as your carrier might refuse to connect you to its network. A future version of GSU should be able to help you recovering your stock IMEI.
  4. NV data is inconsistent
    That's probably because you used a previous patch to unlock your device. If you made a backup before using this third party patch, just restore it. Anyway, it should not prevent you from using your device.
  5. What is the "Locked MCC/MNC" ?
    It shows the list of carriers your device is locked to.
  6. What is the "Stock lock status" ?
    It shows the initial lock status of your device, when it was bought (useful if it's a second hand)


  1. If I buy the "pro" version, will I have to pay for each unlock I do ?
    Once you paid the pro version, you'll be able to use GSU as many times as you want (your order will be saved in your google account).
  2. GalaxSim Unlock unlocked my device successfully, however it didn't give me my sim unlock code.
    On most recent devices, GalaxSim Unlock doesn't use a code to unlock your device, that's why it doesn't give you one. When methods exist to provide you such codes, GalaxSim Unlock will display it after unlocking.
  3. What kind of statistics are collected ? What for ?
    No personal data is sent : GSU only collects unlock errors and successes related to the device model. This data is important to react quickly if there is a problem on a specific device. It also allows us to define which model we will try to unlock next to fulfill users needs. If you want to opt out, you can disable it in GSU options.
  4. GSU is free on Google Play™. However, I need to pay to unlock. Why ?
    Android individual devices are so different (model, rom, root...), that it's impossible to be sure that GSU can unlock yours. We strongly believe it wouldn't be honest to sell an app we don't even know you can use. That's why the order is only requested once your device can be unlocked for sure.


If you have any question, suggestion or bug report, feel free to contact us at

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