Mute On iphone dial pad

[Woodzzz]

Normally during Zoom meetings over my iphone just dialing the meeting phone number to join a zoom meeting not using Zoom app. The host controls mute and unmute. But to make sure background noise on my end isn’t detected l also mute my dial pad. However, the last couple weeks 

l can’t hear 06 you’re muted or unmuted. Even when my phone dialpad isn’t muted.  Also l can hear the participants but they cant hear me even though the microphone on my phone dial pad is unmuted. I’m worried that the group may have heard background conversations and i’ve been permanently muted by the host. Can anyone confirm if background noise can still be heard if you have muted your phone dialpad microphone? Thanks