Are there any Iphone apps that you can record videos on and put them together?

Okay, that sounded confusing. I need an app that I can record 3 or 4 videos and put them together (like a video collage) where they play at the same time. Like, for example, I sing, and I want to have one video of me playing my ukulele, another of me singing the melody, another of me singing a harmony, etc. Does anyone know what I'm talking about? I'd like an app or software for that. And if there are no apps, any editing soft-wares you know that I could do that on? Please answer- Thank you.

IPhone 4S front camera problems?

I bought an iPhone 4S around Thanksgiving. And about a week or two after wards I started having issues with the front camera. It gets dark, and blurry, and looks like is is glitching. I took it into an apple store and they reset it and said the problem was resolved. But it started happening again a few days later.
if you are wondering, I'm very careful with the phone, I have an otterbox on it, and I have only dropped it once, but the problem was occurring before I dropped it. What is the problem?

What will use my data on iPhone?

What will use my data? I'm getting an iPhone soon. How much data is 1 gb? Will these apps waste my data: Subway Surfer, Facebook, and Twitter. I know FB and Twitter will when I'm outside Wi-Fi, but will Subway Surfer waste my data?

How to put the photos from iPhone photo stream on your Mac computer?

Okay I have a iPhone 5 and 4 the 4 is deactivated and I need to get the photos from photo stream onto my computer. I'm running mac osx snow leopard so I'm a little outdated but I really need to put these photo stream photos on my mac, because some ( and by some I mean 400) of the photos I want are not in my regular album. So how do I go about this?

How to transfer SOME OF THE SONGS from my Mac to my iPhone?

I don't want All the songs, just the ones I may or may not (depending on a WHOLE other question) have done the YouTube to Mp3 thing. How can I do it? And when I try to sync it, it says it will delete all the music I've already downloaded, so help?

And is the YouTube to Mp3 converter safe? What's 1 you use that works well? There's this song on YouTube I want on my library So BAD! Search "Give Me Sweets Hyper Blossom" and there's this one japanese song with these three girls dancing to the song.

THANKIES IN ADVANCE!

Will Best Buy give me an iPhone 4S?

I have a warranty on my iPhone 4 at Best Buy and from the look of the website, they don't sell 4's anymore. So do you think they'd give me a 4S since I have a warranty?

How to know if there's an unactivated sim card in my iphone 3gs?

I want to update this iphone that has no service, and I found on some sites that as long as there's a SIM card, whether activated or unactivated, I could update it. But how do I know if there's one without taking it out? If I have to take it out, is there some kind of penalty for it?

How to get text messages forwarded to me without the iPhone owner knowing?

I have 2 iPhones in my name through Vodaphone Australia. I was wondering if there's any ways to be able to get messages sent to and from my second iphone onto my first iphone without the user of the second iphone realizing?

I just want to know if it is possible and how to forward the messages to my iphone. No comments on why I would do this and how wrong it is snooping into others privacy please.