Sounds works on iPad, not on iPhone

I’m using wave files for SoundEffects and mp3s for Song. The sounds play fine on my iPad, but not on an iPhone. Has anyone seen this before?

I’m using a build from the trunk on 6/17/2014.

Thank you.

Turns out there’s a mute button on the side of the phones. Ugh.

Yep… that totally has fooled me in the past!

Happened to me in the past. Worth mentioning that if you change the rotation lock to mute mode, mute the device then change the switch back to lock rotation you cannot turn off mute from the settings.