Why is there a circle in the top left-hand corner of my iPhone's screen?

Today, I turned my phone off and back on again and when it turned back on, there was a circle in the top left-hand corner of the screen.

When I click it, it comes up with the options "Voice Control," "Favorites," "Device," and "Home."

What is this? Is is some kind of new update? Is there a way to get rid of it?

Should I update to iOS 7 beta?

I really wanna update to iOS 7 beta 4 on my iPhone 5 and check out all the cool features, but I'm afraid that I'm gonna lose everything (contacts, pictures, apps, music, etc.) and that I have to go back and try to restore everything. Also, I'm not so familiar with iCloud, and I backed up on my computer too, so if there's a way to get all your stuff back onto my iphone 5 on ios 7 like contacts, pictures, apps, music etc. Please tell me!

IOS 7 beta 4 not getting notification for text

I have an iPhone 5 on iOS 7 beta 4 with text message on banners on notification settings. When I'm on my phone, it won't tell me when I get a text message. Not even a sound. Please tell me how to fix it or if it does it for you. I still get a sound when it's locked though. I also tried to put it on alerts but still no luck.

I'm running on ios 7 beta version 4?

I'm running on ios 7 beta version 4 i think. And i wanted to know when will ios 7 beta version 4 stop working? Would it stop working? Since i upgraded to the beta version can my iphone stop working getting bricked or any problems?

Turning off iPhone and leaving it in the car?

I'm going to Six Flags tomorrow in California and was wondering if it was safe to turn off my iPhone completely and leave it in the car. Would it damage anything even if it was turned off?