Why does my iPhone 4 say I have only 700 MB left?

I only have songs and no apps or games. I have 230 songs that take up 1.6 gigs.

That might be used for the other category on itunes

Go to where you bought your phone hun goodluck

How big is the internal memory? Back everything up and restore factory settings then, bit by bit add what you want unfill memory full, rest is saved on computer.