Coscto and BB are good judges based on traffic and such.
The difference is laptops are used for content for the most part, a must for work, but at home the phone is more a necessity, you can do almost everything but serious content creation on it.
Net sum: You need maybe one or two laptops at home and you replace them when they break, even don't care much about harddrive with free cloud storage at places like google etc. Phones are getting good enough but you will for the most have one for every man, woman and child in the richer countiies
PC about a billion floating around with 5 year life cycle = 200 million sales OUCH OUCH OUCH
Smart Phones closing in on ~ 25% penetration of 7 billion people = 2 billion installed with 3 year life time and the rest of the world everyone wants a smartphone and dont' need no laptop.
x86 sales 200 million and about flat
ARM sales more than a billion and growing, slowing but a BILLION guess who as economy of scale, can afford huge factories and deep pocket R&D, ain't Intel, took Intel way too long to realize due to arrogance. The 10nm embracement of ARM and LG is too late as TSMC and Samsung and the other foundries will be doing billions of ARMy CPUs as Intel just gets started doing 200 millino x86 and maybe 50 ARM for LG.
Time for a huge restructure of the company!