In light of the fact that wifi is a lot faster that 4g LTE
[wifi is slower than LTE] and the fact that its equipment is a lot cheaper to manufacture on the phone (device) and for transmission when compared to 4g LTE
[they are not comparable technologies to start with, 802.11 technologies operate in the free to air spectrum, for you to use at home or in the office with a single access point while LTE is designed for commercial grade networks which operate with multiple access points working together over entire cities, provinces, countries], recent developments state that it can go up to 1.5 gbs,
[802.11a,b,g,n cannot do 1.5Gb/s, LTE, WiMax and others can reach these speeds on point to point backhaul links, end users on point to multiple point links will never see these speeds with these or 4G technologies][802.11ac max speeds are calculated over 160Mhz with 8antennae each side, unless you stay far far away from civilization, 160MHz of contineous open spectrum in the 2.4Ghz range is a fantacy] are there any companies investing in the use of this technology countrywide.
[2.4GHz is unlicensed, hence a limited shared resource. The more companies that invest and put up their own outdoor networks, the slower speeds for others will become, unless all these networks peer with each other and form a single organised network] There are still arguments as to whether LTE is 4G or not because its maximum speed are below 100mbs.
[LTE is not 4G. LTE Advanced is 4G]