IPhone internal memory used mysteriously?

I have an iphone4s 16gb. I'm supposed to have 13.5 gb space available. But 4.6 gb of space has been blocked out. In iTunes it is showing by the name of others. In settings, that 4.6 gb has no mention. My total data is 5.7 gb and I only have 3gb space available. I had reset all data on this iPhone and synced it with a new Apple ID.

Can my sim card from samsung work in an iphone?

I have a samsug galaxy s2 from straight talk. It uses at&t towers. So my friend is gonna give me his old iphone 4s. Can i just switch the sim cards will it work? I also pay for data and stuff.

Is my iphone 5s charging properly?

Everybody I talk to says it shouldn't take longer than an hour to charge fully. Mine seems to be taking longer. For instance, I was at 20% at 740pm. Now it's almost 920pm and it's at 99%.It seems to slow down a lot when it gets in the 90s. Is this normal or what? I don't have a ton of apps either.

How to not use data up on Iphone 4?

I had a limit of 2gig of internet when I got my phone activated through Verizon and now the internet won't work and I went back to the store and the manager said it was because I used up the limit of data on it. How do you not use the limit of data on it?

How to download high quality music?

I used to use the youtube mp3 downloader extension but then it got taken off the internet or something so i need a new way to download High Quality Mp3's. Idc if its an extension for google chrome or Firefox or a mp3 website i just need something that will let me convert music off youtube videos into mp3's or just get Hight quality mp3s, so I can put it on Itunes then on my Iphone! Does anybody know any good sources to let me do this?

I don't know what to do but it's driving me mad?

I had the iPod touch fourth-generation for a while now but recently I got the iPhone 5c. All the music that is on my iPod touch fourth-generation is also on iTunes. When I tried to transfer the music from iTunes onto my iPhone 5c not all of the music transferred over. I went back on iTunes and all the music that didn't transfer over was still on but they had a little i to the left of the song title. When I click on the song it says that the song can't be found and I have to locate it. Is there anyway that I could transfer the music that is still on my iPod touch fourth-generation over to iTunes so that I could put it on my iPhone 5c?

Why won't my iPhone play music through my car?

I have a 2011 hyundai genesis and there's a USB port. I have tried two different cords and four different iPhones and all of them had the same result. The iPhone says trust this computer then goes away faster then I can press anything. After doing this multiple times, the screen on the car will say reading error. Any idea why this is happening?