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Where do you see the 239 MB: in Settings - General - Storage & iCloud Usage:
In Storage, or in iCloud?
A first advice what to try: reset your iPhone. This won't remove data or change settings. Press and hold Home and Power button until the Apple logo appears. Then let go of both, your iPhone will power up on it's own.
If the available storage on your iPhone is low, connect your device to a computer and take a look at it's storage in iTunes. It's possible that an unususal amount is taken by something called "Other" (orange colour). If that's the case, restore your iPhone via iTunes. That should help getting rid of most of the "Other" storage.
Hope that helps.