Unlocking your Samsung Galaxy SIII (S3) is a smart move that can boost the utility of your device, making it possible to use different carriers and potentially save on your mobile bills. Here are three ways to unlock your Samsung Galaxy S3:

1. Unlock Code from Your Carrier

One method of unlocking your Samsung Galaxy S3 is to request an unlock code from your current service provider. To obtain the code, you’ll need to contact your carrier’s customer support and follow these steps:

a. Provide your account details, including name, account number, and the contact information associated with the account.

b. Explain that you want to unlock your Samsung Galaxy SIII (S3) and provide the 15-digit IMEI number located on the label under the battery or by dialing *#06# on the device.

c. The carrier will verify if you are eligible for unlocking and might require a waiting period depending on the account status.

d. Once approved, your carrier will send you an email containing the unlock code.

e. Insert a non-accepted SIM card into your phone and turn it on.

f. A prompt will appear asking for an unlock code; enter the provided code to complete the unlocking process.

2. Unlock Through a Mobile Unlocking Service

There are numerous third-party mobile unlocking services available online which can provide an unlock code for a fee. Select a reputable one and follow these steps:

a. Locate the IMEI number of your Samsung Galaxy SIII (S3) by removing the battery and searching for a label or by dialing *#06#.

b. Go to a trusted online unlocking service website and input your device’s IMEI number, model, current carrier, and country of origin.

c. Pay for their service according to their pricing policy.

d. You’ll receive an email containing an unlock code along with instructions.

e. Insert a non-accepted SIM card into the phone and turn it on.

f. Enter the provided unlock code when prompted to complete the process.

3. Rooting and Unlocking via Custom ROMs

This method is more advanced and only recommended for those already familiar with rooting their phones. It requires you to install custom firmware on your Samsung Galaxy SIII (S3) to achieve the unlock:

a. Download Odin, a utility used to flash custom ROMs onto Samsung devices, and save it on your computer.

b. Find a suitable custom ROM specifically made for unlocking your device and download it.

c. Turn off your Samsung Galaxy SIII (S3) and put it in Download mode by pressing the “Volume Down,” “Home,” and “Power” buttons simultaneously.

d. Connect your phone to the computer via USB cable and open Odin on the computer.

e. Follow the instructions provided by the custom ROM developer to flash the firmware onto your device using Odin.

f. Once complete, your phone will reboot, and you can insert a new SIM card from any carrier.

Take note that rooting may void your device warranty and sometimes a custom ROM may also lead to potential instabilities in your device’s performance.

These are three ways to unlock your Samsung Galaxy SIII (S3) so that you can use it with any carrier you like. Take care when following these methods, ensuring you only utilize reputable sources to avoid bricking or damaging your device in any way.