Why do most celebrities and Hollywood stars use Iphone instead of Android phones?

I know some celebrities who endorse Samsung and other smartphone brands but behind the camera, they use Iphone.

Added (1). I know some people who are not wealthy; not even come from affluent clan, people don't earn that much but they managed to get an iphone through postpaid plan/instalment basis. They don't care if they will bury themselves into debts just to make themselves look wealthy/classy.

How to PERMANENTLY delete certain music from my iPhone?

I was originally told to go into music, click the '…' and hit remove download (and I also tried the "delete from my music" button), but every time I plug my phone into my computer and let iTunes sync (mainly so I can put new songs in) they come back. I want them gone. I want them to burn in the fire in which they came from. HOW?

Instagram app is broken (read details)?

So I log into my account and it says you have violated terms.

I have never done anything to violate the terms so I go to the computer version of instagram and I log in and it works.

No matter what account I try it says I violated the terms on the mobile app.

But on the computer no matter what account it always works

Please help me fix this

Added (1). Its not been violated because it works on the computer version. Its a problem with the app

Added (2). THE ACCOUNT WORKS ON COMPUTER JUST NOT THE APP

Added (3). I fixed this by erasing my iPhone and starting over

What does this mean? IPhone?

I sent an iMessage to my friend, using his iCloud email. It immediately said "not delivered" I tried again and it said "not delivered" again, I tried 3 times. So I chose the "send to email" option

What does this mean? Is his phone off?

Added (1). It's weird because it's never done this when I message him

Added (2). My phone is fine…

What's a good music downloaded like iTube?

ITube ised to work so well, it sucks that they had to take it down.
I'm basically just looking for a app exactly like iTube was where I can download music and listen to them without Internet
I know iTube has like a new app called playtube and it doesn't even download music -.- just plays it… So is there another app I can get for my IPhone 5s that will download and play music without Internet?