"Urban Airship bills itself as the leading mobile engagement platform — and our research bears that out. This particular study spans 3,000 apps in use by 500 million users who were sent 100 billion push notifications throughout 2014, so it’s an extremely comprehensive overview of mobile user engagement and opt-in rates."
http://insight.venturebeat.com/report/mobile-marketing-automation-how-most-successful-apps-drive-massive-engagement-monetization
I think this is why vMob have quickly moved their HQ to the US. But their going to need some serious funding if they want to be relevant.