I just bought Minecraft on my iPhone. I started the game on WiFi, but when I turned off data and was away from WiFi, it won't even launch. It gets to the Mojang icon, freezes, then quits. When I'm on WiFi and it does work, the sound won't play-either audio or sound effects. I've already checked the settings-but it didn't work their either. I've had this game for around 24 hrs. 
thanks for your help!