Oh the humdrum state of smartphones these days. No crazy designs like the good old days and absolutely no innovation. Or is it? With screens dominating more than 90 of the phones, there isn't much smartphone manufactures can do in terms of design but Vivo is on the way to becoming the undisputed king of the smartphone industry when it comes to innovation. The cornerstone of our claim is thanks to the new Vivo X21, the first smartphone with an in-display fingerprint sensor. All you need to do is stick your thumb on to an illuminated part of the screen and bam, you're in! It's not only a technological breakthrough but it's also as cool as a cucumber dipped in liquid nitrogen. Along with that truly awesome feature, the X21 sports a 6.28 inch display, 6 gigs of RAM, Qualcomm's Snapdragon 660 processor and AI smarts. At ₹35,990 that’s Iron Man level tech without being a billionaire like Tony.