How to switch all my info from one iphone to another?

How can I switch all of my stuff on my iphone to another iphone cuz my phone is really cracked and stuff and my sis just got an iPhone 6 so I wanna switch to her old iphone because that one isn't cracked (btw I have a verizon, i don't know if that matters or not) so how do I switch them? Do I have to call verizon? Or can I just do it straight from my house?

What's wrong with the App Store?

I recently deleted an app on my iPhone and when I tried to get it back, the App Store said that it wasn't available in the us market. It's been the same with several apps I've had before but can't find. Is there something wrong with just my phone? Is anyone else having this problem?

My iPhone 5c signal doesn't work?

Hi, so this problem has been happening recently where my phone will have service and like in the next 5 minutes it will say "searching…" And it gets real annoying so i'm wondering why this could be happening and if there's a solution

Black spots on iPhone 5 Camera?

So I went to take a photo this morning and I noticed 3 small black dots on my camera it doesn't appear when I'm on other apps only when I'm taking a picture when I zoom into the dots it kinda looks like sharpie marks?

Where can I get the iPhone 6 cheap?

Hi. I used to have a iPhone, but I switched after it broke back in January. I got a Lg optimus g pro mainly because of the size. But now the iPhone 6 came out and I'm so mad. Since i'm a high school sstudent I don't make enough money to get myself one for the normal price apple is asking. Are there any ways for me to get one at a cheaper price? Maybe if I sold my current phone?

When I clear the Wi-Fi log does it delete the history?

Let's say I go on google.com on my iPhone using my home Wi-Fi. If I log into the Wi-Fi router from the computer and delete the logs, will my history of google.com still be somewhere (other than on my phone history)? Basically I'm asking that if the Wi-Fi log is deleted (by going to the IP address and logging in), is there any other way to see the history of the phone on the computer?

And if I go on the twitter app on my phone, can the Wi-Fi router see that?

If I go on a website on my phone that has a virus, can that virus be transferred to the computer through the Wi-Fi router?

If someone could just explain to me these things it would be appreciated.