How to Network Unlock Att Mobile

  How to unlock at&t mobile sim for lg, samsung, galaxy, nokia, htc and motorola mobile all models.

                     At&t sell lg, samsung, motorola, samsung galaxy and nokia mobile in locked condition. Those mobile are locked with at&t gsm network because they are sold on subsidiary basic or on installment basis so to recovery remaining amount and to keep customer stay on at&t network those mobile are locked and you need sim network unlock code to unlock att mobile so that you can use those mobile on other sim carrier network like t-mobile, cricket, roger, sprint, metropcs, bell, telus and o2.

              Without unlocking at&t mobile sim if you enter other sim then you get error like sim restricted or network locked sim card inserted, invalid or incorrect network sim inserted enter code. For different at&t mobile like lg samsung nokia htc motorola this message is different but in all cases you need to enter sim network unlock pin to unlock your lg samsung motorola mobile.

I am showing you 3 different methods for unlocking at&t mobile sim.

1 method to unlock lg samsung at&t mobile by recovering unlock code house inside your mobile phone.

                  You can find unlock code under dev/ block/ folder on your mobile or also check inside root / carrier folder this is for older android smartphone. In newer version like kitkat marshmallow android os mobile are locked at boot level so you can find unlock code house inside boot partition.

            You can use software app which can backup or copy your mobile partition. You can free download apps from playstore. But it requires super user access to copy or backup your boot partition. Or use below method before that First take backup of all important files and folders on your mobile. 

1.  Download usb driver for your mobile. You can get it from lg, samsung galaxy, nokia or motorola usb driver on their site. Install driver as per your model on your computer.  Now to check that proper driver are installed connect at&t mobile to computer and it will be recognized and found under my computer.

2. Now root your mobile, for that download rooting software according to your mobile. Samsung mobile are rooted by different software lg nokia also need different software. So use proper rooting software. Rooting may heat up your mobile cpu and may cause damage.  Rooting software are in pc version and mobile version.

3. Install super user on mobile and also on computer if possible.

4. Now download sdk - software developer kit and install on computer or atleast download adb and fast boot. Adb is act as a bridge between computer and android devices. While fastboot can rewrite your system partition.  Adb -android debug bridge is executable file.

5. Once installed all needed software. Now enable usb debugging and oem unlocking on your mobile. For that go to setting – developer option – under this you will find above option. If you don’t find mobile developer option then go to setting – about phone and tap build number 7 times. When you are enable oem unlock it ask for screen unlock code enter unlock code. This is to verify that you are owner of phone.

6. Now boot your mobile in bootloader  or fastboot mode. Or you can open adb on command prompt on your computer and dump or copy your boot partition of at&t mobile which you want to unlock using following command.

dd if=/dev/block/platform/msm_sdcc.1/by-name/aboot  of=/sdcard/aboot.img
This will copy aboot=bootloader to your sdcard. In motorola mobile instead of aboot it may be motoboot. So here we have copied boot partition.
Now copy that file to computer for that adb pull /sdcard/backup/aboot.mbn  /home/admin or your computer login username folder/ desktop/ mobile unlock folder.

                      Let me brief you when you start your mobile, it first load primary bootloader or fix rom that is not rewritable then secondary boot loader and then trustzone tz and then aboot. So this aboot will prompt for unlocking code if you insert different sim other then att sim. Now if you open aboot in hexa editor then it will show like this  sbl1.mbn , sbl2.mbn , sbl3.mbn, aboot.mbn and tz.mbn.  now script code which prompt unlock code is house inside this aboot so when you insert sim other than at&t like t-mobile, cricket, fido, roger, metropcs inside your at&t mobile it invoke to enter sim network unlock pin. Then find start and end point of this inside aboot and modify it and reflash to your mobile system so this will not ask for unlock code when you insert other sim. Also att sim unlock code house within this boot partition I think. But it may be encrypted.  So you have backup your boot partition on your computer now open it in hexa editor and look for unlock code hidden inside it.
                   Now if you have motorola or htc mobile then unlock code house inside this partition. Mmcblk0p6 is partition on htc. Su dd if=/dev/block/mmcblk0p6  of=/sdcard/mmcblk0p6.  This motorola or htc unlock code is in hexa decimal so open it in hexa editor and convert it to decimal and then enter as sim network unlock pin.

Method 2 : Generate unlock code for att mobile from imei number of samsung galaxy, nokia, lg, motorola or htc mobile.

You can easily generate unlock code for your at&t mobile from imei number. There are many apps and software available for free to generate unlock code for lg, samsung, nokia or motorola att mobile.
You need 1. Imei number of your at&t mobile.
                   2. Make and model number of your at&t mobile. Lg k10, v20, samsung galaxy s8, samsung s7 edge, nokia lumia or nokia 5g phone, motorola moto g5,
                  2. Location country where mobile is locked
                   3. mcc /mobile country code for at&t sim usa= 301, uk=234, Canada=302
                   4. mnc / mobile network code for  at&t usa mnc code are 070,090.
At&t maxico mcc=334 and mnc at&t maxico is =010,050.
This software and apps generate four kind of unlock codes 1. Nck  2. spck  3. Defreeze or unfreeze code 4. Nsck. Here nck is your sim network unlock code.
Once unlock codes are generated use below steps for unlocking smartphone.

Lg at&t unlock steps
Power on device and enter code 2945#*7101#. Select setting – then tap on security –  then select option sim lock – network – then deactivate – now enter 8 digit  nck network unlock code for lg. Now att lg mobile is unlocked and it is free from at&t network. Steps for different lg models are different.

Samsung at&t mobile unlocking procedure
Power on samsung mobile with other carrier sim like t-mobile, roger, fido, cricket. Now it prompt for sim network unlock pin or enter  code #7465625*638*. Now enter unlock code for samsung mobile. You get successful unlock, network lock deactivated. Your samsung mobile is unlocked. Different samsung galaxy model has different steps.

At&t nokia unlock steps:
Start nokia mobile with other sim carrier bell or telus, fido, sprint or Verizon simcard.
Now sim unlock dialog box open. Enter 8 or sometime 20 digit nokia lumia unlock code. Tap enter. Now your nokia lumia is unlocked. Different nokia mobile has different unlock procedure.

At&t motorola unlocking procedure:
Insert non att sim and power on motorola.
When prompted enter sim unlock code for motorola. Tap ok. Now motorola is unlocked. You get network unlock successful message on screen.

3rd method for unlocking at&t sim and mobile:

Here we get unlock code from at&t itself.  For that you must have used at&t sim or mobile for 60 days. You have fully paid your remaining amount of your att mobile. Now go to atnt site and submit unlock request. You will get email with unlock code within 2 to 3 days.
Now to unlock at&t htc mobile :
Start your htc mobile with other carrier simcard mini or microsim.
                   Now you get network locked sim card inserted enter htc sim network unlock code. Enter unlock code which you have received via email. And tap ok. Your htc mobile is sim unlocked.

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