Over 400m people are using mobile ad blocking browsers

"We explored the numbers of app downloads from over 100 Google and Apple app stores across the globe in partnership with Priori Data, and drew data from StatCounter’s network of over 3 million Web sites.
Here are the key findings of our research:
At least 419 million people (22% of the world’s 1.9 billion smartphone users) are blocking ads on the mobile web.
Both mobile web and in-app ads can now be blocked.
As of March 2016 an estimated 408 million people are actively using mobile adblocking browsers (i.e., a mobile browser that blocks ads by default).
As of March 2016 there are 159 million users of mobile adblocking browsers in China, 122 million in India, and 38 million in Indonesia.
As of March 2016 in Europe and North America, there were 14 million monthly active users of mobile adblocking browsers.
A further 4.9 million content blocking and in-app adblocking apps were downloaded from the app stores in Europe and North America since September 2014.
20% of the world’s smartphone users are using mobile adblocking browsers, which are mobile browsers that block ads by default. This is an order of magnitude greater than many had believed."

Source:  Data from PageFair, in INMA, 20th June 2016

Note - Page Fair sell services that combat ad blocking, so while I'm not disputing these numbers, it's in their interests to say that ad blocking is on the rise