Another iPhone getting my messages?

My sister and I both updated our iPhones last night to the new iOS 6 format and now she's getting all my messages also. I'm not getting any of hers though, she can just see all of mine. Does anyone know how to fix this?

Music transfer from iPhone to new computer?

I recently got a new PC because my last one is broken, but when I sync my iPhone 4 only the few amount of songs I've purchased from iTunes are displayed. How can I get the songs that I've downloaded elsewhere, which are present on my phone, onto iTunes on my computer? I tried one transfer software but the free trial only allowed me to transfer 3 songs, so if you know of any efficient ways to transfer that are harmless and free that would be of much help.

YouTube not available on iPhone 4?

When I try log in to my account it says "YouTube not availible" I tried logging in on computer and it let's me but just not my phone. How can I fix this?

How to get the free iPhone 4 without changing my plan?

I have had a verizon plan since as long as cellphones have existed. I don't want to buy a new plan or anything extra, I just want the IPhone 4.Is there anyway I could get it unlocked and then just put it in my system? What are my best options?

How much can I sell my iPhone 4S for?

I'm in the process of getting a new phone and want to sell my iPhone 4S. It's 16gb, in very good condition and 6 months old? I don't know how much I'd get for it though thanks.

My iPhone 4s won't connect to Wi-Fi?

My iPhone will not connect to Wi-Fi, i've been using only 3g for a few weeks now. When I go to general --> wi-fi it says "on" but nothing happens. No networks are shown and if I manually type in a network it says "could not scan for wireless networks". Now I can't get the software update because you need to be connected to Wi-Fi to do so. Please help!

I've turned off my phone, reset it, and reset network settings… Not sure what else I can do!

I know it has nothing to do with the wi-fi itself, I'm on a big university campus and no one else is having this problem.

How to prevent my iPhone from being tracked?

A couple days ago I received a message from AT&T (my provider), saying that my phone can now be tracked by my mom's phone. Is there any way I can prevent this short of turning it to airplane mode or off?