By 2018, a consumer in a mature market will use and own more than three personal devices, according to Gartner. The research company estimates that in 2016, the installed base of devices will total 7.8 billion units (including wearables, mobile phones, tablets and PCs) and is on pace to reach 8.3 billion units in 2018. Gartner expects mature market users to use three to four personal devices from a mix of "main" and "niche" devices. Main devices will include smartphones, tablets, convertibles (two-in-one devices) and notebooks, and will contribute to more than two devices per person at any time. Niche devices will include a growing range of wearables such as smart watches, health bands, smart glasses and new types of connected devices such as smart cards, e-readers and portable cameras. Report