@Hilsangel
The only connection between mobile data and wifi is the phone so yours sounds faulty.
I'd contact Samsung to get it checked https://www.samsung.com/uk/support/contact/
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)