Why can't i catch a song on any app on my iphone 5s? - 1

I recenty bought an iphone 5s and i downloaded the app iTube to download music, i can listen to the song while i have Wi-Fi but when i want to listen to it without Wi-Fi i can't. I doesn't let the song 'catch'? My friend have the iphone 5s also and it works for her. Anyone can help me?

It's because all their songs are online there for you need a internet connection to listen to the songs your buddy obviously uses her 3G or 4g internet connection when she's not connected to Wi-Fi to listen to them

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