Its been a while since weve seen an ASUS smartphone that wasnt meant to be used with (or as) a tablet, but the company is making up for that absence by launching the ZenFone line. The ZenFone 4, 5 and 6 all sport dual-core Intel Atom processors and a range of exotic color options. They also tout a new interface layer on top of Android 4.3, ZenUI, that promises both simplicity and a Whats Next feature for tracking your daily schedule.