In other words, it lets you connect to the Internet on your laptop, tablet, or Wi-Fi enabled device, using your phone's data connection. Tethering is very useful if you happen to be in an area that has no free Wi-Fi and you need to do your computing on a device other than your phone.In United States, many of the service providers charge their users for tethering the internet connection. The charges vary from 10$ to 30$ depending upon their service providers.
United States is the only country in the world where carriers charge you twice for the same internet you already paid for. In countries like South Korea, Thailand, and the rest of the world, there’s no extra tethering monthly charges to use the wifi tethering feature.
Luckily, there are ways to circumvent wifi tether block on most Android smartphones or tablets (that support SIM cards) by installing tether apps.
Rooted Android Phones:
Step 1. Download Wifi Tether TrevE Mod app and install using ES File Explorer (or your favorite file manager app). Make sure “Unknown Sources” is checked under Settings if it asks you to.
Download Wifi Tether TrevE Mod APK
Step 2. Open the Wifi Tether app, hit Menu button and hit “Settings”.
Step 3. Press on “Change Device-Profile”.
Step 4. Choose “Generic ICS/JB (wlan0)”.
Step 5. Choose “Change Setup-Method”.
Step 6. Choose “Netd-Ndc (master)”.
Step 7. Choose “Send Netd Max Client Cmd”.
Step 8. You can set your wifi encryption and SSID here to whatever you’d like.
Step 9. Make sure either “WiFi-driver reload” or “WiFi-driver reload 2″ is checked on. If wifi tether fails for some reason you can change this to the one you didn’t use.
Step 10. Scroll down and make sure “MSS clamping” and “Routing fix” are both checked on.
Step 11. Turn on tethering by hitting the Wifi icon.
Step 12. You can check logs by hitting Menu button->Show Log. If you don’t see any errors you are good to go.
Step 13. Now, try connecting to your wifi tether using your computer or another wifi device. Once connected, it should show up under Access Control. (hit Menu then Access Control)
Step 14. Enjoy your wifi tether without paying carriers twice!
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Non Rooted Android Phones