5G smartphones will take even longer to become relevant for most people, so it doesn't matter if Apple or any other manufacturer doesn't release a 5G-capable phone in the next couple of years. 5G ranges can be less than 1 km in many cases, so there is going to need to be a many-fold increase in the number of cell towers. To add to that difficulty, each tower will need a fiber connection to it to get the kind of speeds that are being promised. In my mind, if you have to run that much fiber, you might as well go to FTTH.