Help to find paper for a research project on How people are filling mobile storage

Hello there,

I am working on a project for Advanced Operating Systems and I need to find a paper or a source that tells me about there things:

- How many users fill their storage and are out of storage
- How many users use SD cards
- How are they filling this storage or How is mobile storage is being filled ( e.g. ratios how much people store pictures, videos, games, apps etc. )
-

I am looking for a similar paper for about 2 weeks now but I just cant find anything useful. :( :confused:

XDA looks like a place that can help me on this or if there is any thread that talks about this it would be great to lead me there,

Thanks