Mobile users love to connect to the Internet, and they want to be able to get online from anywhere . Since cell coverage is much more widespread than Wi-Fi coverage and can provide Internet connectivity directly to Android smartphones, many carriers now let subscribers share that connectivity with their other devices. This means that 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. 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.