Ipone 4s problem after iOS7 update?

Me and my girlfriend started having problems with our iPhones after we updated to iOS7. When my girlfriend sends a message to me it also sends the same message back to her own phone. Some of the messages she sends also come up on both of our phones saying that i sent it. And there have been messages between me and a couple of my friends that have iPhones that showed up on her phone, just as a conversation between me and my friends. We can't figure out why its doing this. It only started after we updated to the new ios7. And it dosnt happen with normal text messages only with iMessages. I was just wondering if anyone else was having that same problem, or if anyone knew how to fix it.

Added (1). @pissy_old_lady… I don't umderstand why it would start doing it now though.before we updated to ios7 we were signed into imessage with the same id and never had this problem. But after the update it started doing this.

What in the world is a book?

Just heard about it on a TV show. What is it for? Can I do one on my Macbook/Iphone?

Added (1). P.S IF I can do one on my Macbook/Iphone, does it work in the United Sates of America as that is where I live?

IPHONE 4 picture quality good?

I know they are are more "bigger" "Better" Iphone out now vs. When the Iphone 4 came out around 2011 according to all the big apple users out there,
but I have never had an Iphone before and always dreamed of having one,
I can't afford the new one that is out right now, but even the Iphone four I heard is still pretty awesome so.
I was wondering for anyone that had or still has the Iphone 4, how do you like the picture quality? (I'm big on taking pics!)

I used to have the HTC Wildfire by the way, it was a little below mediocre, wasn't crazy so the iphone is a bigger stepup.

IPhone won't let me update to iOS 7

I have a iPhone 4 and I decided to update to ups 7. I started around 6pm and its 9:17 now. I only have a 8gb phone so I had to delete like everything (apps, photos music etc.) after I got enough room to update I let it download for about a hour and a half then it says I need even more room! It required 622 mb but when I go to my usage it says I only have 136 mb available and 109 mb are being used by photos and camera even though I deleted all my pictures. It says that I'm currently using 6.2 gb so I can't get my apps back yet until the updates done. How do I get more mb! I really need help here!

My iPhone says it's not activated?

I have a iPhone 4S 16 gb, after I updated my phone to iOS 7 it says it's not activated. A day later it worked fine for about a day then it kept on again and it's been about 3 days and it still doesn't work. I've tried turning it off and on, take out the SIM card and still nothing.

How to buy iphone 5s without ruining already contract?

I'm looking for a new phone. I have an Android and its just stupid. I'm thinking about getting a new iphone, and i saw the new iphone 5s. I'm currently in a contract with my family member. Is there a way i can get the iphone 5s without canceling the contract?

How to upload data to my iphone from my computer without wiping the phone clean?

Some time ago, I purchased a macbook air (beefed up ipad), and have downloaded some movies from itunes to it. I hooked up my iphone, and synced pics, calendar, phone book, notes, etc, and I want to upload a movie from my itunes library to my phone.
Everything is 'ghosted out', and when I go to click on 'sync all movies', It tells me everything on my phone will be deleted and the library on my computer will be synced to the phone.
I don't want to lose 28 gigs of movies and music on my phone.
How can I upload movies from my mac to my iphone without losing all my data?