Garageband only playing a part of the song
On the mobile version of GarageBand, I put a song but it only plays the first 30 seconds of it
iPhone 5, iOS 6.1.3, I use T-Mobile.
Does your song have several sections?
Then open the song section controls (Tap the Song Section button "+" on the right edge of the ruler).
To play all sections in the song, choose "All Sections".