SIM card is a card the most common in our life, it can be inserted into the call and send information in the mobile phone, whenever and wherever possible and relatives, friends and communicate with the students. If the phone card is not carefully being locked, how to do? The most simple way of course is typing the PUK passcode to unlock your phone, or bring your phone to the nearest mobile phone business hall and ask someone for help.

But, if you forgot the PUK passcode, and there is no mobile phone business hall near to you, what's worse, you're in a hurry to make a phone call or sending a message. How to do now? Fortunately, for for the users of Samsung Galaxy S2/S3/S4, it will become more simple. Because, you can easily SIM unlock your Samsung phone in few simple steps by using the software which is named Android SIM Unlock.

Steps to SIM Unlock Samsung Galaxy S2/S3/S4

Step 1. Download, install and run the program on your PC, then enter the unlocking mode.
Step 2. Connect Samsung Galaxy S2/S3/S4 to PC.
Step 3. Enter USB Settings / Diagnostic / Service Mode.
Step 4. Unlock the Phone in a click.
Step 5. Restore the phone to normal mode.

Related: How to Unlock Samsung Galaxy S2/S3/S4 without losing data

Read the video guide here:


https://www.youtube.com/watch?v=bppH_nQvRn4

There are many ways to unlock a phone and I sort the safe way to unlock mine, through permanent unlock service from Unlock-zone.com