Comment by bohinjc

Not OP but I use multiple sources when doing consulting on mobile strategy. Not sure if every source allows to copy/paste data here so I'll just name the sources here :

- comScore MMX Multi-Platform, January 2017

- Deloitte Global mobile Consumer Survey, May 2016

- eMarketer, App Marketing 2015: Fighting for Downloads and Attention in a Crowded Market, July 2015

- Selio user acquisition costs