Why data service is not working on my smartphone?

[AC Question]

Hi,
I get no internet on my Xiaomi Mi4i when I use data service. Neither while using web browser nor while using any other app. But when I turn my phone into a hotspot, I get internet on the connected device (my laptop). That is, the same web page that is not opening on my phone opens up on the laptop.

I called my service provider (Airtel) Customer Service. They asked me to swap the SIMs. That worked for some time. But is not working now.

Will be grateful for your help

 

[Golfdriver97]

I'm curious if there is a hardware issue. Have you called Xiaomi about it?