Galaxy S3 can share its internet connection with your laptop, which means you can connect your Galaxy S3 to the Internet in any location where your phone can get a data signal from your carrier. So, Tethering is one to one (you connect a phone to a laptop), and the laptop must have the right drivers to make it work.

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To set up tethering (Internet sharing) on your Galaxy S3 GT-i9300, follow these simple steps:
Step 1: Go To Galaxy S3 “Settings” ,then “More settings”.

Step 2: Now your are on the Wireless and Networks Menu. So,chose the “Tethering and portable hotspot”

Step 3: Enable “Portable Wi-Fi hotspot function”.

Step 4:Setup your network name- network SSID ( any) and network key to only you or authorized person for access- Password (any). The security on your Wi-Fi is provided by providing the password using the WPA2 PSK security.

Step 5:Click save.

Step 6: Open your PC or laptop Wi-Fi, then search your Galaxy s3 network SSID which you have setup, then enter the password. Now your PC or laptop can connect to internet.