Grey circle on lockscreen iPhone 5s?

This is going to sound really vague, but a girl in my class has an iPhone 5s and when I looked at it I saw that she had a grey circle on the right of her lockscreen. When she touched it some kind of settings menu appeared.

I asked her what it was, but she just said you could get it by changing something in your settings, then she had to go. She also said she didn't jailbreak it.

So my question is if anybody knows what it is

Iphone5s spring for 450$ will work outside USA?

Currently i live at the US but i travel much to europe, i wanted to buy a new phone.
While i was shopping on ebay i came across an iphone 5s (spring) for 450$ , So i was wondering if i bought it will it work outside USA? Do i need to buy something for it to work? Will it work at every country worldwide?

My iphone battery is going crap?

I charge my iPhone 4S and it goes to 20% in 2 hours being at stand-by mode.

So I got 2 questions:

(a) Does iPhone have its battery integrated in it or can you get it out?

(b) If it is integrated in, what can i do other than charging it every 2 hours?

Are there any clash of clans hacks that don't involve surveys?

I'm using an iOs (iPhone 5c) and have it jailbroken with Cydia. It seems that every hack I've run across except for the iModGame one (which doesn't involve gems, just getting attacked) requires you to do a survey. Does one exist WITHOUT having to do a survey and get gems?

Will a plastic case scratch an iphone?

I'm getting my first iphone tomorrow and I really want to take care of it. I want this hard plastic case but it's a pop on case, and will taking it on and off scratch my phone?

I always keep my old small tablet in a dirt free environment, so dirt hasn't gone under the case to scratch it. But my tablet case is a different soft material. I'm just wondering if the plastic itself of the case will scratch my iphone when putting it on and removing it.

Got an iphone account problem?

(Long story-short)I bought an iphone 4 second handed. Downloaded asphalt 8, and now i want to update it but can't caz it asks me for a password for"wstevens01@gmail.com", i asked the person who sold me the phone, and he said that wasn't his account. I tried resetting the phone but no change… Help?

Is there a fast way to turn off all comms on an iphone, BUT calls and texts to conserve battery?

I was wondering if there's a one button way to turn off all comms, push notifications etc, except calls and texts(or maybe even calls only) in order to conserve battery?
I also heard of a mode on some Android devices that would also turn your screen black & white and dim it.
Does anyone know if there's some sort of an App or something like that that would allow you to have such functionality?
Cheers

Wav to mp3, and does that change the pitch?

Please, one small question, how to safely convert wav songs to mp3, so they can play on iTunes and I can load them on my iPhone.

Secondly, I have used Audacity to convert the pitch from 440 Hz to 432 Hz for these songs and saved them as.wav because it doesn't allow me to save them as.mp3. Will this conversion from wav to mp3 change the pitch from 432 Hz to something else?