Why Can't I Hear Anything On Vine?

I just got an iphone 4 and downloaded vine but i can't hear anything! And my volumes all the way up!

There's a switch on the left side. Flip it up to there the orange line is NOT visible. The switch should be up and your volume will work

Maybe your phone is silenced? On the same side as your volume buttons, push the thing on top of them up if it's showing orange

Omg!

I can't hear either but there's no orange line… Help

Same I'm on I pad I don't have an orange line

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