Why does my iPhone 4 crash randomly?

Recently, over the past couple of weeks or so, my iPhone has started crashing very often. It happens on every app - the camera won't load, safari crashes regularly and games such as Draw Something won't even run. I've tried deleting apps, pictures and videos to make room, but that hasn't had any effect. I've tried closing apps that are open (double clicking the home button and swiping up on the apps) but that hasn't done anything either. I'm not sure if it's because of iOS 7 - it was fine to begin with and there have only recently been problems.
I've made sure everything unnecessary (e.g Bluetooth, etc) is off. Is it possibly a virus? If so, how do I check for one and get rid of it?
Everything is slow, and I don't know how to fix it or to stop it from happening. Any ideas?

Does my brand new iPhone 5s have a virus? And how do I remove it?

So I didn't have money to buy any songs off of iTunes and I can't connect my phone to my computer to get songs off of YouTube mp3 because I didn't want the information on my iPod to go I my iphone so I heard about Idownloader and free music app and I used them to download music off of mp3skull a week later idownloader said "your phone has 13 viruses use these steps to remove them" and then when I clicked on okay it redirected me to get a random app so I knew I should just delete idownloader and then I deleted free music right after because it's basically the same thing my iPhone is the brand new iPhone 5s and I literally just got it almost 2 weeks ago and since then the phone has frozen 4 times I don't know if it's because of iOS 7 or the virus my phone apparently has should I go to apple?

How to save up for an iphone? - 1

Okay so i have and ipod touch 4g which i got last year with MY OWN xmas and bday money and now the back of it is scrached to death the home button doesn't work properly and the apps keep shutting down and the battry goes down really quick. I also have a samsung galaxy y which is so small i can't text properly and you have to pay for the internet and i use the internet quite a lot on my ipod but i can only do that when i'm in wi-fi… So i would like an iphone As soon as possible (4s AT LEAST)… And i don't want to do those lemonade stands or anything. I know i could sell stuff on ebay but i'm only 13 so i would have to use my mums account but i was thinking about selling my ipod so does anyone know how much i could get for that with the condition it is in? So does anyone know any other way appart from lemonade stores and ebay to get money please! Thanks xxxxxx

Added (1). i also have my own bank account with around £100 xxx

Advice on passing theory test?

I'm looking for the best way to pass my theory test, what cds would you recommend or what apps for the iphone would you recommend?

Where to order cheap iphone cases?

What are some good websites where I can order some super cute iphone 5s cases for cheap prices? I like getting the knock off brands like tory burch and what not for good prices.

Why is my Wi-Fi so slow when I'm within range?

I recently got Xfinity, and for the first month everything was fine. But now, I can't load anything on my devices unless I'm within 15 feet of the router. I can be further away, and get 2 or even 3 bars on my iPhone, but no pages will load. I'm well within range, but something's wrong.

It's an expensive Netgear router, and I have high speed internet, so I know nothing's "wrong" with the router. I've tried to call Comcast but all they tell me to do is reset it. I've reset the router in as many different ways as I possibly can. Also, sometimes it will work perfectly for a day or two at random, and then go back to being terrible. I find it obnoxious that I'm paying for high speed internet, and yet can't even use the Wi-Fi in half of my house.

Could I be doing something wrong, or maybe need to change a setting? Ethernet and wired connections work perfectly, it's just Wi-Fi. Maybe it's just something on Comcast's end that they've screwed up but they're no help.

My iTunes won't recognize my iPhone?

My iPhone won't recognize in iTunes anymore. I reinstalled iTunes, stopped, restarted, and repaired the AMDS (apple mobile device support), did the same thing with the iPod Service, I restarted my iPhone and my computer… Every time I plug it in, it makes the connected "ding" then when I press "Trust this Computer" it makes the disconnect "ding" but it's still charging and connected to my computer, but not in iTunes. Ugh all I wanted to do was download some ringtones but OH NO. Someone help please! I don't know what to do!

Should i go with Telstra or Vodafone?

I'm looking to get a iPhone on a contract and want to know which service people prefer and if they have ever had any problems with telstra or vodafone