https://www.cnet.com/news/no-qualcomm-snapdragon-855-doesnt-automatically-mean-5g/

But it's up to the handset makers to decide if they want to actually include the X50 modem or stick with 4G. 

The decision to bring the Snapdragon 855 to market without 5G underscores that the transition to the next generation of cellular technology won't exactly be seamless. Despite all of the positive 5G vibes sent out at Qualcomm's Snapdragon Tech Summit this week, its availability remains limited. And each transition takes years before the kinks are truly worked out. That includes being able to deal with the complexity of integrating 5G with the technology powering the phone's smarts.