What does rebooting an iphone do?

I was on an app on my iphone 5 when a message came up telling me to reboot it because of memory usage (or something along those lines). I rebooted it (hold the power and home buttons down) and it restarted as normal. But why did it ask me to reboot?

What wireless provider should I use?

I have a simple phone and am currently using Verizon on a family plan with 3 other people. I have an IPhone 4 which isn't activated. I would like a plan which is max about 25-30 dollars a month. It would be great if I could keep my phone number and use my iphone. If it was only a data plan then that would be fine because I could use free apps for texting and calling. Does anyone know how much it is to have just data from Verizon? What other company's are really cheap? Any feedback would be helpful, thank you in advance.

What wireless provider should I use? - 1

I have a simple phone and am currently using version on a family plan with 3 other people. I have an IPhone 4 which isn't activated. I would like a plan which is max about 25-30 dollars a month. It would be great if I could keep my phone number and use my iphone. If it was only a data plan then that would be fine because I could use free apps for texting and calling. Does anyone know how much it is to have just data from version? What other company's are really cheap? Any feedback would be helpful, thank you in advance.

Iphone 5 camera & flash not working?

I still have the warranty for it, my phone works but the led flash can't open and only the facecam works I tried downloading a flash app but says led does not meet requirement or is not supported, I was wondering if apple would give me a new phone since it's a hardware issue:/ , I already tried resetting it etc.

Can I buy an iPhone 5 off Amazon?

I have an iPhone 4, but it's cracked and I want to buy an iPhone 5 or 5s, but I don't want to have to wait another year for my contract to expire, or pay 700 dollars for it. If I buy one off of Amazon or Ebay can I just replace the sim card into the new phone and have it work?
Or would I have to buy it and then take it down to AT&T to have them activate it?

Restoring iPhone ON A DIFFERENT COMPUTER?

Is it possible to restore an iPad/iPhone or update it ON A DIFFERENT COMPUTER than the original one?

My friend found an iPad and he tried to restore it on his computer but iTunes doesn't let him.

Is there a work around for this?

Added (1). Also note, he does not know the iCloud password of the user's iPad

Issue with text messages on iphone 4s?

So i've had this issue for a while and if someone could give be even a little bit of info, it would be much appreciated.
So, Over the past year, i have had an iphone 3gs, a samsung galaxy s3, and now i have an iphone 4s. The reason everytime that i got a new phone was because randomly, my texts would just stop sending, like it would just say "message send failure" and i couldnt receive texts either. I also couldnt get or receive calls. I have realized that this started happening when i started texting my one friend, it only happened when i would text him. I proved this by texting him from my moms phone and texting noone else, and the same thing happened to her phone.
i'm just wondering what could be wrong with his phone that is doing this? It only affects my phone, everyone else he texts doesn't have a problem. Hes with telus so could be bring it in and ask him what's up?

Gold or Space Gray iPhone 5S? - 2

I'm getting a new iPhone 5s later today and I'm still undecided on the color. Which color do you find more attractive, or let me rephrase this. Which color do you think looks more sleek and professional?