IPhone s6 Memory disck full?

I have IPhone s6 16 Gb Gold color
but some problem with my smart phone
When i download any app form Apple store an error (Low Disk space) instead 15.5 gb space free

WTF is an iPhone S6?

No 16GB phone would EVER have 15.5 GB free for you to use.

Might be a glitch, backup everything on iTunes and then factory reset the phone. After doing so, Restore the phone from iTunes backup.

You mean an iPhone 6s?

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