I can't receive calls on my iPhone 4s?

When somebody calls my iphone, they get directed to a busy signal.

when my phone is called, it doesn't ring, or even prompt that i'm being called ( meaning if i'm staring at my phone, no visual or audio changes happen when i'm called). After the caller hangs up, my phone will notify me that i have missed the call.

other details that may help:
I have google voice enabled.
i'm using Sprint.
When i text people, it sometimes shows two different texts from me, coming from different numbers.

I suspected that google voice was the problem so i already have disabled it with no effect.

How to kick iPhones off of Wi-Fi?

My brother has a bunch of friends over and he gave them the Wi-Fi code without my permission. I don't want them using our Internet for various reasons. Is there anyway to kick them off?

How to move pics from folders on iPhone?

Ok we'll I know how to move them but I just didn't know how to word this " how to take a picture and make it go to a folder you made instead of just going straight to the camera roll? " I made a folder called summer2013(: and I wanna have 1copy of the picture in that folder so I moved some in there from my camera roll then when I go back to delete thee first copy in my camera roll it says delete everywhere and deletes it from my folder I made. I hope you got my question and understand all that. Sorry.

But thanks for help!

Can my parent's be viewing my texts?

My parents told me today that they logged into verizon online and were able to read my texts. They wanted to see if i actually invited my friends over. So i had sent a group text stating "The water park is going to be closed tomorrow and when i woke up this morning my mom knew exactly who i sent it to and what exactly it said. I know she didn't get my phone. I always have it on me or in my hands and it automatically locks when i shut it off. I also know for a fact that my parents would never guess my letter password. So my question is could they have really obtained this information? I have nothing to hide, but it's still annoying. Besides me and my friends have the wackiest conversations. It's awkward if my parents are reading my texts. (oh and if this affects anything i have an iphone)

What is up with my Instagram?

On Instagram on my iPhone (I use the app) it logs me out then when I try to log back in again it says that my password/username is wrong and does not let me back in again when it clearly isn't! It done that with my old account so I made a new one now it's doing it again how do I get back in?

Added (1). Just to make it clear I have deleted the app and re downloaded it

Added (2). And nothing has happened

How to restore back up from iPhone?

So basically I'm going to update my iPhone but the chances are it will wipe everything and I don't want to lose all mot photos, so if I back it up on iTunes will it store it and when I want it back how do I get it?