[operian]

For example when you dial *123# from Airtel and it shows the available balance on screen. How to stop that sound without silencing everything else?

[ven07]

You could try turning off system alerts in settings (ringtones+sounds)

[operian]

I tried turning off system alerts as well as every app -specific alerts from the notifications menu. No luck.

[Jagadeeshvanum]

For example when you dial *123# from Airtel and it shows the available balance on screen. How to stop that sound without silencing everything else?

That tone is annoying to me too. I don't know if there's a way to turn it off. But in W10 technical preview that tone is changed.

[ven07]

Well I've tried every which way, but it won't turn off.. It is a system alert (in the sense that it is built in), but there's no way to turn it off.. Try putting this on uservoice :P