Hi all, I'm waiting from my phone, and trying to decide which holster/clip to get. Here's my question: there are times when at work, when I can't take a call, and want to silence the ringtone and send the call to voicemail. Is there a button I can press to do this? Second question: are you able to press this button with the phone in one of those leather holsters (I know there are several) So if you can, which one? Or would you need to get one of those clip on holders? Thanks.