How to change carriers on Unlocked iPhone 5?

I think I unlocked my iPhone 5. I'm from USA and am in Israel currently. I'm trying to select one of the carriers that are listed, but when I do, I still get no service. How can I select a carrier so I can use service?

Headphones won't work on iPhone?

OMG! LIKE WTF?
I just got this iPhone 2 weeks ago after not having a phone for 2 years…
Anyways, this is the third pair of headphones I've gone through within that time and I can't listen to music with them without it shutting off… Like, I have to push it down with my fingers for the music to stay through the headphones and its getting so freaking annoying… I mean, I just gotten this phone and I've protected it and all… Lol I mean there's nothing wrong with the phone, just the earphone thingy…

Is there a way that I can solve this problem, myself?
Thankz

Do you fall asleep with music?

So when I can't sleep, and it's late and I'm having trouble falling asleep, I put on pandora on my iPhone and leave it on all night long till I fall asleep, and trust me it takes me less than 10minutes to go to sleep with music. Does this happen to any of you out there?(I'm 19 btw)

Iphone 4 ios 6 Wi-Fi problem?

I upgraded my iPhone and now the Wi-Fi scanner is somehow deficient. My friend who has an ipod touch ios 5 and she can find the public network with strong signals whereas I can't. The network just doesn't even appear at all. It can still connect to home network though, but maybe it's because the phone is very close to the router. Does anyone know how to resolve this?

How to tell if a radio can play iphone music?

Just cus it has a usb or AUX does that mean it will play my iphones music? It doesn't need to sync with it, i just want it to play my music but i dnt know how to tell and i'm shoping online for radios. What do i look for?