Can I change my iPhone 3GS housing?

Hi, I have recently purchased a factory unlocked iPhone 3GS, I love the phone and it is just what I need, the housing however is a little tatty so I was wondering wether I could buy a new one, and if I could fit it myself, also a rough cost would be good, I don't really trust buying from over seas so uk prices if available

Also the phone black and would like to get a white one is that possible?

How much room does 8gb take up on Iphone 4?

I'm gunna want to text & call people.
& I'm going to want a lot of apps, well not a lot but like social media so instagram, twitter, facebook, oovoo/skype, spotify & all that.
& I'm going to want to take a lot of pictures, I love taking pictures.

Do you think this will be enough?

Red light on wireless modem?

I have an ADSL2+Modem Nethear wireless modem snd today the lights have been flickering to i turned it off and on still flickered so i pushed a thimbtack into the receeding button maybe the reset button? And held it til the modem lights tirned red around the side. I figured this would reset it and make my net all better but no now the light on top looks like an i or p(i don't know anythimg about this stuff) is lit up red abd won't go green. My computers and iphone can connect to internet but can't surf the web or anything else. Anyone can help?

Added (1).:/

Does AT&T text you if you have reached your data limit?

I just got an iphone this month and for the past week or so my imessage has not been working (everything is set up right-it's not the general settings)
I'm not sure if this is because I reached my data usage so it won't send messages anymore? (I'm still on Wi-Fi)
is there a reason for this?
the only thing i can think of is that i may have gone over/reached the limit on my data for the month, but I've heard they text you if that happens & i haven't received one

Which one is better? Iphone or ipad?

I have saved up enough money and i was wondering which is better, i already have an ipod touch 4g, it's getting really slow now. Iphone 5/4S or ipad?

Added (1). @Iceman- I Agree

Gender Studies: Women, What does this study mean to you?

Http://www.slate.com/articles/health_and_science/science/2012/05/dumb_women_do_men_find_them_more_attractive_.html?wpisrc=sl_iphone

Added (1). @Laura So facts, logic, common sense, evidence, science, and rational thinking are "ridiculous"?

typical women…

Can I control my iphone through my apple ID?

Someone stole my iphone and i hadn't had a chance to sync it to my itunes my question is can i control it with my apple ID as in delete all my personal things: pictures, contacts, apps?