How to sim unlock samsung galaxy

How to sim network unlock samsung galaxy for at&t , t-mobile, metropcs, orange or o2 sim.

                    T-mobile, at&t, roger, sprint, Verizon all company sell samsung galaxy models with sim locked condition. There are o2 and orage also sell sim locked samsung mobile. So you cannot use other sim on that samsung galaxy without unlocking galaxy mobile. To unlock samsung galaxy you need sim unlock code.

             When mobile is locked its mobile unlock codes also hidden inside that samsung galaxy mobile. So here I will give procedure to find unlock code from mobile.

1 method to unlock samsung galaxy mobile:
                     You can unlock any samsung galaxy mobile using this method. In this method we will find unlock code hidden inside efs folder. Efsis important partition it has all network related information and imei related information.

                         You need computer, samsung galaxy mobile, rooting software, super user apps, usb driver for your galaxy mobile, android software developer kit –sdk, or adb.

1. Connect samsung galaxy to computer and install usb driver for samsung galaxy or install samsung kies. Make sure you install driver as per galaxy model.

2. Install rooting software on computer or install rooting app on mobile. In other word root your mobile.

3. Install super user app on your mobile.

4. Install android software developer kit or install adb – android debug bridge on computer.

5. Now enable usb debugging on samsung galaxy. And connect galaxy mobile to computer.

6. Now open command prompt on computer and go to adb directory. And then start adb shell.

7. Here we are going to copy efs partition which is stl5 and then find the file named perso. Samsung galaxy unlock code reside in this file. So then we open file in any hexa editer or browser which can open and view fat or vfat formatted files.
             Now mount efs partition by typing this command. You can use other command and parameter if you know unix very well.
                  Mount –o nosuide.ronodev –t vfat /dev/ block/stL5 (efs partition name in some galaxy mobile it is stl4 but in most of the mobile it is stl5). Now open parso file using this command cat /efs/mits/perso.txt. now sim unlock code for samsung galaxy is inside this perso file. It is of 8 digit galaxy sim network unlock codes. In this perso file there are many 00 or ff or hh character and symbols something like that so check carefully and when you found unlock code note down on paper. Now you must unmount efs partition otherwise your samsung galaxy considered as bricked.

              If you don’t want to root your mobile. then there are many free apps and software which can copy or backup android mobile partition. You can download those apps. But those apps need supper user access so grant super user access to those app and backup your efs partition and find perso.txt file and search for galaxy unlock code inside it.

                                Once you find unlock code note it down on paper. Start your galaxy mobile with other sim like at&t, t-mobile sim, cricket, o2 or orange sim. Now you will see sim error message like network locked simcard inserted or  invalid network sim enter correct sim or enter network lock control key. Here enter sim network unlock pin. Enter your galaxy sim unlock code and your galaxy mobile is unlock and you can use any sim with it.

2 method to network unlock galaxy mobile :

                   Some suggest that twicking with efs partition may damage your mobile. And some time your imei number become 00 or corrupted. So here I will go for other file where unlock code is hidden. Path is /dev/block/bml5.

                 Now we already rooted galaxy mobile and we have installed super user. So just go to command prompt and brwose to adb shell directory. Now use below command to copy bml file.
At adb shell $
Cat /dev/block/bml5 >  /sdcard/bml5.bml. 

                                       This will copy file to sd card now transfer to computer. And open this file in hexa editer or and browser which can view fat or vfat file. Now find 8 digit sim unlock code for samsung galaxy.  You will find unlock code 2 to 3 places on this file.  Process for tmobile or at&t mobile unlocking is same for galaxy mobile. Once you get unlock code start galaxy mobile with other sim like fido sim, roger sim, matropcs or bell telus sim you want to use. Now you will get sim error message like - enter restriction code or simcard rejected, enter special code or subsidiary password, invalid network sim phone disabled network locked. Different galaxy mobile get different message but to unlock galaxy mobile you need to enter network lock control key. Enter 8 digit galaxy sim network unlock code. And your mobile is unlocked.

3 method for samsung galaxy sim unlock :
  Latest galaxy mobiles are locked at boot level. For that you need to trick with boot partition to unlock galaxy. I have explained this method in detail at t-mobile unlock for samsung galaxy, lg, nokia or motorola unlock.  Here I will brief you about that method. You can also use above two method for lg unlock or nokia unlocking.

           For this 3 method you need to dump or copy boot partition or bootloader. So root mobile, enable usb debugging and oem unlocking under developer option. Now go to adb shell and copy boot partition. Now open that partition and there is code inside this partition which force to enter unlock code when you insert other sim now if you modify that code or modify this partiton and reflash to galaxy mobile system then your mobile will be unlocked for all gsm sim card. You can also use this method for network unlock lg, nokia or motorola mobile.

            Some of the galaxy mobile are region locked and to unlock those galaxy mobile you need defreeze code and nck code.

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