Why is my phone's Internet connection is still working even after closing data services.

[Android Central Question]

I am using Nokia 7 plus handset with a Reliance Jio sim card. Even if close my data services; I could still receive and send messages on Whatsapp and use other apps that need internet connectivity. Since this has begun the internet speed has also decreased during normal usage.

 

[belodion]

Have you in the first instance spoken to your carrier about it?

 

[Rukbat]

Are you connected to the internet by WiFi? That has nothing to do with mobile data.