Why can't I update my iPhone 4s to iOS 6? - 1

I've tried downloading it from both my phone and computer but everytime I try to it says it error failed to update. But there's no error code or anything it just stops. I'm connected to Wi-Fi and I've tried restarting my Phone multiple times. It's been doin this ever since iOS 6 came out and it's the only update I've had an issue with.

IPhone says memory is full:3?

It says the memory is full, but I have like four apps and 500 pictures… Which isn't a lot compared to my iPod. I don't get why my memory is full:/ It says like 6.5gb but I have 8gb where's the rest and whys my phone use so much memory?

Does a call go through right away when you call someone?

I got this iPhone 5 and I was on Facebook scrolling through stuff and I guess i hit someone's phone number and my phone automaticity started calling the number. I hit end as soon as I could but did that person get that call? I accidentally called someone before and I didn't think it went through cause I hit end right away but they kept calling back. I just don't want this person to have my number.

My iPhone 4 won't send picture messages?

I was working ever sense I got it but today it doesn't finish sending and bared exclamation mark appears and says it failed sending. Why is it doing this? It worked before and I already checked my settings and everything is on.

Do iPhone games really take up Internet connection?

Lately, I've decided to start playing games on my iPhone (Jetpack Joyride, Temple Run, etc). A friend of mine told me that games (in general) take up Internet Connection and if I play when I'm not hooked to Wi-Fi, it'll send the Internet Connection used to my monthly bill (I don't have an unlimited Internet plan, so it might be a problem).So do normal games that (apparently) don't have any Internet Connection also take up Internet from my phone or does that only happen in games that actually use Internet, like "The Simpsons: Tapped Out?"

Do iphones save text messages?

I was searching for a song on my iphone 5, and one of the things that came up was a message I sent a few weeks ago. I clicked it and it just brought me to my messages since I deleted it already. Do iphones save messages? Where can I find these messages if they are saved?