Step 1. Connect your Android device

Launch dr.fone toolkit for Android on your computer, select SIM Unlock among all the toolkits.

Connect your Android phone to the computer using a USB cable. Please make sure you have enabled USB debugging mode on your phone. If your Android os version is above 4.2.2, there will be a pop up message on your phone. Tap on Yes to allow USB debugging on your device.

Part 1. For Samsung S2~S4, Note 1~Note 3

Step 2. Enter USB Settings / Diagnostic / Service Mode

Dial *#0808# or ##3424# or #9090# on your Android phone. One of the 3 will work on your model and you will enter USB Settings / Diagnostic / Service Mode.

Once you are in Service Mode you select the DM + MODEM + ADB or UART[*] or CDMA MODEM option, and then hit "Unlock".

dr.fone toolkit for Android will then start to sim unlock your Android phone. The process only takes a few minutes.

Step 3. Set the phone back into normal mode

After your phone is unlocked successfully, you will have to take your phone out of "Service" mode. Key in *#0808# or ##3424# or #9090# on your Android phone keypad again and now select MTP + ADB or USB[*] or PDA in the menu.

Then click on Next, your phone will enter normal mode and now it's successfully sim unlocked.

Part 2. For Samsung S3~S7

For Samsung Galaxy s3 to s7, the process is even simpler. To sim unlock your Samsung S3 ~S7 device, you should gain root access on the Android phone first. Here you can try Android Root from dr.fone toolkit for Android.

Step 2. SIM unlock Samsung S3~S7

After your phone is connected to dr.fone toolkit for Android, just hit on Unlock. All you need to do is waiting for about a few minutes till the process completes. During the process, your phone will restart once. Please don't disconnect your phone until it's unlocked successfully.