How to make your iphone silent?

I have a iphone 5 and I put it on silent but voice control sometimes pops up how to make that voice control silent

If you mean Siri then you can't completely put it to silent. You can either disable it from coming on you iPhone or hold the home button to make siri come on and then turn the volume down to the bottom one.

There's a mute switch in the corner that I use all the time for ringing or texts, but yeah I think Siri will always still work even with that muted.