Iphone memory and usage

So I have a 16 GB iphone 5, and 0 bytes left. 3, 187 pictures, a fee folders of apps i use, and 108 songs. Lots of iMessages. Do the iMessages take up usage (NOT CELLULAR DATA) but as in memory on my phone?

I do not think that iMessege can take a lot of storage unlees you keep plenty photos and videos there.
Try to check the storage: how much is taken my pics? (your amount of pics looks quite huge) and by the apps?

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