We all know that smartphone sales have slowed down recently, but it's apparently been especially sluggish this past year. According to Strategy Analytics' latest report, global shipments grew by 10 percent from Q3 2014 (323.4 million units) to Q3 2015 (354.2 million). However, 10 percent is tiny compared to previous quarters, making this the slowest growth rate within the past six years since the global recession in 2009. The research company attributes the industry's poor performance to the "increasing penetration maturity in major markets of the US, Europe and China." In other words, most people who want smartphones already have one, and not everyone can afford replacing theirs every year.