Why is my iphone saying the memory is full?

Okay so I have a Iphone 4s and I went to Germany last month and before I went I emptied my phone, like I moved all photo's/videos onto my computer so I would be able to take lots of photos whilst away, and that all went fine but since I've been home whenever I try to take a photo or film or whatever a message pops up saying the disk is full? But that can't be, because before I went away I had nearly 2,000 photo's on my phone and it never said my memory was full and I only have 715 photos so that doesn't make sense, I don't have alot of apps either?

Why do people want bigger iPhone screens?

The new iPhone 6 is reported to have a bigger iPhone screen. Screen size in general seems to be the number one topic of discussion when it comes to smart phones and I still can't figure out why. Apple shrunk the iPad to the iPad Mini and now the iPhone is going to be bigger. Considering the iPad and iPhone are almost the same in function, why is it necessary to have a bigger screen? Why can't people just buy the iPad Mini instead? The biggest issue I see is how you put a phone that big into your pocket. Wouldn't it be uncomfortable to have a wallet sized phone in your pocket? I ask this question because I want to know if it's just me that finds a big screen absurd and somewhat counterproductive.

What is the stereotypical American family?

We have to write the stereotypical American family of the 21st century and then debunk how they are not true for class. I was thinking blonde mom, teacher. The dad is a brunette doctor. They have one daughter and one son. The daughter is blonde and popular in school, makes As and Bs. She has an iPhone 5 and has sleepovers every week. The son plays football, is good looking and popular, makes Bs and Cs. They have one dog and live in a big house. The family is Christian baptist and goes out to eat in a fancy restaurant once a week. By the way, I made this up. My family is nothing like this.

How much would it cost to upgrade iPhone?

Okay so here's the deal… I've had my iPhone 4s for nearly 4-6 months but I really want to update to iPhone 5c. I'm obviously not ready to just upgrade for free so that's why I'm asking how much would it cost me? I'm on sprint by the way just in case any sprint users know. My sister had the iPhone four but she had hers for at least a year before she updated to the five c and it only costed her one hundred dollars and that's why I'm wondering what's the deal and I just need lots of details!

Can an iPhone without a carrier be unlocked? - 1

I own an iPhone 4 which doesn't have a carrier, I checked online to which country it's from and it shows it's from USA and carrier shows (AT&T, Verizon, Sprint)
But on my setting there's no any of those carrier… So help me out guys coz I'm confused totally
Can an iPhone without a carrier be unlocked - 2

What iPhone should i upgrade to? - 1

I currently have an iPhone 4 8gb which i just dropped and broke the back. Now i want to upgrade to a newer iphone but i'm not to sure which one to get. I need alot more gb's on my phone i have no room on my phone and only have 100 pics and 2 apps. I really want a 64gb phone but i don't know if thats reasonable. I take alot of videos and pictures and like to have like to pages of apps. For music i usually have around 500 songs tops. I'm gonna make a list of my options and can you tell me what my best option would be.

IPhone 5c 16gb- $49.99
iphone 5c 32gb- $99.99
Iphone 5 64gb- $199.99
Iphone 5s 16gb- $149.99
iphone 5s 32gb- $299.99
iphone 5s 64gb- $399.99

What would be my best value with the best features and storage size?