Network Problem in Galaxy M31

[Members_f2h7dO1]

I am using Airtel and Jio but none of the networks are upto the mark. I checked network on others phone and they are working fine. I tried all the basic troubleshoot but not working. Kindly let me know if this problem can be fixed or the only way is to replace my phone with other model. 

[Samsung_Support3]

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve your device network issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-mobile-network-issues/#:~:text=1%20Check%2....

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support