I'm hoping this is not a grey area as 'smartphone' means a lot of things. But I need to know if I am looking at statistics that say 'smartphone' does this cover all phones with a browser or are there phones with browsers that are not included in this statistic.
For example this Google infographic: 
Says 37% - 50% of Australians now use a smartphone. Am I safe to assume this means approximately half of Australians have browser enabled phones or is there another percentage say 10% or whatever that has crappy old phones that also have a browser like my wife's old Motorola?