onger reflect the end-user experience. The introduction of smartphones has shifted the customer's habits towards data-centric activity profiles. Recent smartphone activity statistics have shown that only 25% of the usage time is spent making voice calls, while the remaining 75% is split between a variety of use cases ranging from radio/video streaming, web browsing to online gaming or social networking. With the exception of radio streaming, all of these activities imply an active and heavy touch-screen activity. And improving touch-screen user experience, such as web browsing, has pushed OEMs to use larger, higher resolution screens. Figure 16.37a shows that the screen size has grown on average from 3.0 inches in 2007 to 5 inches in 2014. This trend, together with ever-increasing screen resolutions, has pushed chipset vendors to deliver always more powerful graphics processors and application engines [8]. The combination of these two factors has dramatically changed the power supply budget of a chipset: in feature phones, the cellular subsystem dominates the power consump- tion over screen activities, the power amplifier (PA) being the largest contributor at high output powers. In smartphones, the consumption distribution is reversed [8]. Figure 16.38 illustrates these impacts by comparing a smartphone power consumption using animated wallpaper (a) versus a static picture (b). Both measurements are performed with identical backlight levels (50%) and all radio subsystems being switched off, that is, UE is in flight mode. With 1.7 W consumption, the animated wallpaper more than doubles the UE battery power consumption. This explains why the modern superphone, with its powerful application engines, high- resolution displays, requires a battery capacity which has nearly doubled in 7 years, reaching an average of 2500 mA-h in 2014 (Figure 16.37b). The emergence of phablets can be clearly seen with battery capacities in excess of 4000 mA-h and screen sizes greater than 6 inches. Had the energy efficiency of lithium-io