Many companies restrict tethering on pay as you go plans.
Sepandan, if you use android you can still use tethering on restricted tethering plans just by downloading a free app. There are many apps, but many server ads, have data limits or are a paid app. There is also no need to root your android phone.
Here are the steps to get you tethering:
- Download Tetherify from the Google Play Store.
- Set a wifi password in the Tetherify app
- Turn on wifi tethering in the Tetherify app
- On the device you want to connect to the wifi, find the correct wifi network in your wifi settings and enter the wifi password.