Advertising on the internet is commonly accepted these days, as is ads in things like magazines. But receiving ads on a smartphone, and one that's been fully paid for? Now that's bound to push a few people's buttons. Unfortunately, it's exactly what HTC has done recently, pushing an advertisement in the form of a notification to its One M9, M8, and M7 model phones. To be clear, HTC has never offered its One handset with a price subsidized by ads, similar to Amazon's cheapest Kindle model, thus users are not happy about it.