If you reside at United States and Europe, you will get many Samsung smartphone at cheap rates. But those samsung galaxy and galaxy note mobile are mostly locked with sim card like at&t, t mobile or us cellular. Even Verizon 4g sim are also sold along with Samsung galaxy nexus and galaxy s4 note etc.
Now after few months you have very good roaming or outgoing calling offer from other sim provider. But when you insert new sim to your galaxy android smartphone, you get message that invalid sim card- network locked sim card inserted or you get message that sim restricted or sim not accepted. This happen because your Samsung galaxy is locked by sim gsm service provider. Your galaxy is network locked.
But you need not to worry. Here I am going to explain the entire procedure for unlocking Samsung galaxy note and Samsung galaxy sim unlock without unlock codes. First you need to understand that how mobile sim network locking initialize within your android os software. Then you can easily unlock your galaxy android mobile.
Your Samsung galaxy all models network sim lock initialize by 1.perso sha256 and 2. nw lock/ network lock nv data initialize. This two comes under network lock option. If you tweak with this two modules you can unlock your Samsung galaxy note 2, galaxy note 3 and galaxy note 4 and any Samsung galaxy phone.
For above option you first need to enter Samsung galaxy note service mode by this command-
*#0011# or *#197328640# or *#27663368378#. There are different ussd commands for entering galaxy service mode. As there are many samsung galaxy models. If above commands are not working with your galaxy model then try mode preference menu command that is *#2263#. Here I want to tell you that you fist enter service mode of your galaxy android mobile then only you can get galaxy network unlock code option.
Once you entered service mode of galaxy note you will get this 5 option. 1.umts 2.cdma 3. Lte 4. Sim 5. Run efs synce. For your information this 5th option useful when your imei no is not valid or you are facing network registration problem.
Now tap on first option umts. Then on next screen tap on debug screen option.
Under debug screen tap on phone control option.
Now you get network lock option tap on network lock option.
Under network lock you have 5 options. 1. perso sha256 info 2. perso sha256 on 3. perso sha256 off 4. Nw lock nv data initialize 5. Rat_free_supporting on.
Here is the trick for unlocking Samsung galaxy note. Focus on option 3 perso sha256 off and option 4 network lock nv data initialize. First tap on perso sha256 off option. This will enable perso sha256 off flag. This will take around 30 second to enable perso sha 256 flag. This will stop prompting unlock code. But still there is network lock enable within your Samsung galaxy note. To disable or rewrite that network lock function tap on nw lock nv data initialize that is option 4. This will wipe out your network locking. Now reboot your phone.
Now insert new sim other that gsm service provider who locked your phone.
You Samsung galaxy note will not ask for network unlock code or sim unlock code. And your Samsung galaxy unlock fully. And you can use any sim like at&t , t mobile, us cellular, Verizon, vodafone etc.
For information 5th Rat_free_supporting on option- this rate free supporting on option is used to change band without rebooting or removing sim. You can change or turn off lte and you can use 2g /3g without removing sim. For that just tap on option rate free supporting on than it says now rat free supporting on. Then use *#2263# for setting modem/ radio. But this will lock your mobile to one band again.
Do you think Samsung galaxy note unlocking is such easy – no. This gsm sim provider like at&t, t mobile or us cellular have very advance technology. T mobile uses device unlock app. Now there is no unlock code they verify mobile via internet as per imei number of your phone. Mobile companies like Samsung are smart they block or hide above network lock option or you get 1. perso sha256 info and Rat_free_supporting on options only. There is no perso sha256 off option and you will not find Nw lock nv data initialize option. More important when you enter this code *#0011# or *#197328640# or *#27663368378# nothing will happen. Now what to do for unlocking samsung galaxy.
Just go to android phone setting – about phone and find baseband version of your modem it is also called modem / radio.
Now find the software as per your mobile baseband version and copy that software to your mobile memory and install that baseband modem software to your smartphone with the help of computer. There are many Samsung galaxy model and each model may have different baseband version so make sure you download proper modem software.
Now reboot your mobile now you will get network lock option and also you will find perso sha256 off option and Nw lock nv data initialize option. And many android smartphone secret codes which are not working, those codes also start working on your Samsung galaxy mobile. Now follow the above galaxy unlock procedure on your mobile. After you unlock your smartphone’s network lock and free your galaxy mobile from locking. You can upgrade to latest baseband version.
I hope above procedure help you to unlock your Samsung galaxy smartphone.
Source by: samsung mobile site