Apple iPhone 4s Wi-Fi Greyed Out, Anything I Try Doesn't Work?

I have a iPhone 4s, and the option to turn the Wi-Fi on or off has been greyed out? For i can't change it from off? I have gone on Apples website and looked there and i have done what they said-
Restarted the phone
Updated to the latest version of ios (6.1.3)
Connected to iTunes
See if anything pops up on there
but no, nothing seems to work. I do what they suggest and its still greyed out, I can't use the interet. What should i do please help!

Mac book pro won't connect to my Wi-Fi

My mac book pro won't connect to the Internet for some reason? My iPhone 4 connects to the Wi-Fi easily but my MacBook can't find the network! I don't know why? Anyone have any solutions? I've tried restarting my computer and some other stuff people have said to do on the apple help page, however I don't have 'airport' on my network settings? Maybe because my MacBook is American? I'm not very good with my computer so I think I need an idiots walk through for it please?
Anyone help! Xxx

How to change your iPhones name?

Like on the iPhone on the right top corner next to the time it's says your phones network like Verizon, Sprint etc. How do you change it? I see ppl on twitter or Facebook that takes screen shots on their iPhones and it has their names on it or something else. Can you do that without jail breaking your phone? If so, how? I have an iPhone 3G btw.

Why did she ask for my number? - 1

I started my job a couple weeks ago and this girl started working the same time. We work different departments so we only see each other a little bit. One night we got off the same time and we ended up just talking for about 30 minutes. She wanted to show me her speakers in her car so we were sitting listening to music. She wanted to show me something on her phone and then she gave me her iPhone with the new contact open and said you should give me your number. So I put my info in her phone but she hasn't texted me or called and it's been a few days. Why would she ask for my number then? She's 18 and I'm 21. She does have a boyfriend but In not the one who asked for a number and I regret not asking for hers.

Why does my internet keep disconnecting?

My wireless internet keeps disconnecting on my laptop.
It works perfectly fine on everyone else's laptops and it works fine on my iPhone too.

My internet is not slow at all, but it CONSTANTLY disconnects. It only does this on my laptop.It'll do it at least 5 times a day.

How do I stop this? It's clearly my laptop.

Samsung Galaxy s4 v.iPhone 5?

I'm getting a new phone in a couple months. I'm deciding between between the GS4 and the iPhone 5. I have a Galaxy S1 as of right now, and I have never had an iPhone, so I wanted to switch, but the release of the S4 now has me in a dilemma.

iPhone 5:
It's stylish. Everbody has an iPhone, so the world has adapted to it. The iTunes store is clearly stronger than Google Play and music is much more organized and better on the iPhone.

Galaxy s4:
It is a powerhouse of a phone. It has a better camera, specs, and is faster than the iPhone. S4 has the bigger screen at 5 inches.

So, which one?

Why won't my iphone show up on my computer when i connect it?

I connect my iphone to my windows laptop with a cabel thingy and it shows up that its charging on my iphone but it doesn't give me any options to transfer media etc. Also when i go on 'computer' it doesn't show up even though it should because its connected?

Why can't I iMessage or text message certain people?

I've had an AT&T iPhone 4 for about 5 months and everything was fine but about 2 months ago, it stopped letting me text 3 of my friends who also have iPhones ( 2 Verizon iPhone 5s and 1 with sprints iPhone 4S). When I type a text and hit send, the sending bar loads but when it gets to the end, the text just disappears. I tried turning iMessage off and texting them but they still never get it. I can't text other iPhones perfectly fine but not them for some reason.Me and couple of my friends have a group message and my one friend that I can't text gets my texts in the group but I don't get any of hers. Any ideas why this is like this? Or what I should do?

What's better, AT&T, SPRINT, or VERIZON?

I'm wanting to get an iPhone 4s because i accidentally washed my old phone. Need a carrier too… I just don't know who to go with. Please, no biased answers.