Is it hard to replace a iPhone screen?

So, I cracked my iPhone 4 REAL BAD. I was thinking of replacing the screen myself. But is it easy to do it? I saw some videos on youtube and wasn't too sure, if a 15 year old could handle this. What's the difference between the $90 ones and like ones under $40?

Has anyone bought an iphone from Zwee.com? Is it legit?

I've been looking for an iPhone 4s unlocked for a while now but, I don't want to spend an arm and a leg for one. (I've been an Android user for years so I don't know if I'll like iOS so I don't want to waste money). Anyway, I came across Zwee.com and they have iPhone 4s Unlocked for $177 and I'm unsure as to whether or not I should buy from them. Have any of you bought anything from them or heard if they're a scam or not?

From USA network to NZ network?

I have an iphone from USA and it is currently under a US phone carrier/network.i'm just wondering if anyone knows how i would go about converting it to vodafone nz and if i can even do that?

Why is everyone so obsessed with the iphone?

I have a galaxy s3 and I love it. Everyone else I know has iphones. I will list some comments I get and my responses.
"Ew that phone is so big. Iphones are way better."
Well it may seem big to you but until you handle it for a while you wouldn't know. The screen is big and has amazing resolution and considering the amount of time I spend on my phone, its a luxury.
"Iphones have way more capabilities"
No they don't.Name one.
"Iphones are so simple. That phone has features you don't even use"
Well if youre not smart enough unveil this phones hidden simplicity then fine. Sure the iphone is simple, but other phones can be simple too with even better qualities. Why do so many people not understand that!

Text message and iMessage? What's the difference?

My mom gave me her old iPhone to have and AT&T disabled the phone when she got we new one but I put my SIM card in from my old phone and it works perfectly. I've been texting from it but in some conversations it says text message with green bubbles or iMessage with blue bubbles. I have unlimited texting so do I get charged to send or receive messages with either text or iMessage? And my dad says he has a detailed bill so he can read text messages I have nothing to hide but I was curious to see if that was a tulle true, and if I have Wi-Fi can I use the Internet on my phone without it charging to the data plan? Or does it cost even when I have Wi-Fi?

How to delete photo albums on my iphone 5?

I made some albums on my iphone of some pictures i took on my ipod and now i can't figure out how to delete it and its taking up space? I tried going to the album titles and deleting it and it won't let me. I've also tried going to the individual pictures and deleting it but it won't let me. I plugged it into my computer and it doesn't show those pictures on my phone so i'm not sure what to do. Does anyone know what i can do to delete them?