Internet is not working except Whatsapp application In Xiaomi Mi 2 mobile, I can't connect to internet except Whatsapp application which is running smoothly.
I can't open any website on any browser also Gmail and other apps are not working.

This happened after phone reset and changing sim.
I called AirTel customer care, they say that internet is fine from their side.

Please suggest something to fix the issue.
Thanks
I finally found that proxy was set to some ip in APN setting.
    I removed proxy and saved APN setting. And Internet is working fine now.


  Mobile Networks > Access Point Names > open the one APN > delete the
  content in Proxy