Can you use a prepaid sim for iPhone 4s?

I just bought an iPhone 4s but I don't want to start an subscribstion(abbonement, don't really know how to say it in english).
Can I just buy an prepaid sim for it? And how will it work? Do I have to buy a certain amount of credit every month? Or buy a special iPhone prepaid sim if that exist?
I live in the Netherlands btw

IPhone 4 Wi-Fi Connection Problems?

I have an iPhone 4 and last week the Wi-Fi signal strength symbol was not showing up at the top. I read things such as turning airplane mode off and on but it didn't work and after about an hour it randomly came back. Today it has done the same thing and I have not been able to get Wi-Fi back so I have to use 3G. Does anyone have a solution for this?

Why can't I take photos/videos on iphone?

When I go into my camera to take pic or video, it says there's not enough storage room. I only have 86 pics (with only a few videos) I used to have ALOT more than that & I was still able to take pictures/videos. What is the problem here!

How does your iPhone 4s internet works with a prepaid sim?

I just bought an iPhone 4s but I don't want to start an subscribstion(abbonement, don't really know how to say it in english).
Can I just buy an prepaid sim for it? And how will it work? Do I have to buy a certain amount of credit every month? Or buy a special iPhone prepaid sim if that exist?
I live in the Netherlands btw.

Is redsn0w.us the real redsn0w website? Or is it a fake?

I accidentally went to that webpage to get redsn0w since when googling redsn0w that was the first result so I thought that was the official website.
I then read that you should only download it from blog.iphone-dev.org
Is redsn0w.us the official website or is it just a "fake" website?

How to save up for an Iphone in 1 month?

I'm thinking of saving my money up for an Iphone. N I really need this phone fast. I'm a teenager I don't have a part time job. Please give me some advises on how to save my money up for this phone.

Thanks o. Please help me

Added (1). I get allowance every Thursday. I get 50$

Tips on transferring certain songs from iTunes to iPhone, please?

Okay, so I have like 8.3 GB worth of songs on my iTunes. But I only have a 16 GB iPhone which of course doesn't necessarily mean it really is 16 GB. So most of the space has been occupied by my gazillion photos and apps, so here's my request:

Do any of you have some tips on how to make my life easier and transfer the songs I like the most and leave the ones I don't listen to that much? My space budget is around 4 GB.