How to make more room on my iPhone?

My iPhone is a 6.22GB one and it's almost completely run out of room. I only have 435 songs on it and not very many photos, but a looooooot of room is taken up by 'Other;' almost half of what the songs take up. I'm not sure what 'Other' is or how to delete it. I'd like to add more songs but there's only 0.04GB left.
Does anyone know what I can do to delete some stuff from 'Other'?

You can't. It's an Apple device.

You can't

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