IPhone won't download purchased song?

So I downloaded a song on my iPod. Then I tried to download the same song on my iPhone, but next to the song (where you would click to boy) says purchased and won't let me redownload it. I checked in my library, then under purchases and don't see it. How can I get it to download? I don't even care if I have to pay for it again, I just want the song on my iPhone.

How to open my iphone past the insert valid sim without a sim card?

First generation iphone, i want to use it as an ipod… Don't know much about it but i only want to use it as an ipod, my boyfriend got a droid x and we got past the insert valid sim page by touching the four corners… Is there anything like that for the iphone? Maybe someone has a link to a youtube video or step by step instructions? It has been restored so its competely empty… I don't have a sim to put in it and i don't think i need one cause i don't want to activate the phone part… Just want music pics and games lol

Should I buy a iPhone 4, 4s, or 5 and get it unlocked?

I want to buy a iPhone 4, 4s, or 5 but I'm with T-Mobile so I would have to get the unlocked service the unlocked costs alot so i was wondering is it cheaper to get the phone then take it to get unlocked or eBay the unlocked one. Also if i buy the phone then get it unlocked what service should i get at&t, sprint, or verizon. *I'm on a budget

Added (1). When will T-Mobile get the iphone?

Where can I get a cheap iPhone 4/4s?

I've had it with Android and all the problems that they come with but I can't afford a brand-new iPhone. I want at&t so I can switch out my SIM card. I'm paying $30/month for unlimited 4g and text and 100 calling minutes so switching plans is out of the question. The iPhone 5 is a stupid waste of money; nothing about the phone is special. I just want an iPhone 4 or 4s that's less than $450. I'd consider on of the 3s if the price was right. Craigslist and pawn shops and those oddball websites are too sketchy and the refurbished ones all have contracts attached or cost a freaking arm and leg. Do I have any other options?

Do iMessages cost when sent internationally?

I live in Alaska and I'm texting a friend in British Columbia. We both have iPhones and we have been texting using iMessages. Will this count as international texting or towards my data? The texts are always blue, not green on our screens. My network is AT&T.

Can't listen to iTunes music?

Ok so I got the iPhone 4S and I got a fewiTunes gift cards, and I entered the code and redeemed it. It said I had $40.00 in my account. So I searched for "gangnam style" and I got it for $1.29. Then I went to my music app and tried to listen to it. It said gangnam style was one of my songs, but it was all greyed out, and there was no play button! So I went back to the iTunes Store, and tried to buy it again, but it said I had already purchased it, but not downloaded it. How do I download it?