Free Tethering Fix app info
Since the release of android 4.1.2 a change has been made and your carrier will recognize if it's tethering or normal internet traffic and if tethering it's not included in your plan they'll apply addictional rates. After a month of google research i found a thread on the official android support forum where a user posted the solution. Free Tethering Fix will help you applying this fix automatically at every boot, so you'll not be charged of other fees for the tethering traffic.