Step 1: Connect your Android device
Now you are required to connect your Android phone to the computer with the help of a USB cable. But it is quite important to make sure that you have enabled USB debugging mode on your android phone. If your Android OS version is above 4.2.2, then remember that there will be a pop up message display on your phone. Now simply tap on Yes so that you can allow USB debugging on your device.
Part I: For Samsung S2~S4, Note 1~Note 3
Step 2: Enter USB Settings / Diagnostic / Service Mode
At first, you have to dial *#0808# or ##3424# or #9090# on your Android phone. Any one of these three numbers will surely work on your model and then you have to enter USB Settings/Diagnostic/Service Mode.
Once you get in touch with its Service Mode, you can then select the DM + MODEM + ADB or UART[*] or CDMA MODEM option, and then simply hit "Unlock".
After the above process gets over, dr.fone toolkit for Android will soon begin to sim unlock your Android phone. It will take only a few minutes to complete the process.
Step 3: Set the phone back into normal mode
When your android phone becomes unlocked successfully, then you will have to take your phone out of "Service" mode. For this, you have to key in *#0808# or ##3424# or #9090# on your Android phone keypad and then select MTP + ADB or USB[*] or PDA in the menu.
After this, just simply click on Next, abd then your phone will enter normal mode and you will see that it is successfully sim unlocked.
Part II: For Samsung S3~S7
When it comes to Samsung Galaxy s3 to s7, the process is quite simpler than the above. in order to sim unlock your Samsung S3 ~S7 device, first of all, you should gain root access on the Android phone. Below you can get the idea for Android Root from dr.fone toolkit for Android.
Step 1: SIM unlock Samsung S3~S7
When you get your android phone connected to dr.fone toolkit for Android, then you just have to simply hit on Unlock. After this, you have to wait for a while till the process completes. Your phone will get restarts once during the whole process. But is important to keep in mind that you don't disconnect your phone until it's unlocked successfully.
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