Oh… Almost there
It must say ‘Verizon’
In that case dial *#*#4636#*#* and click on Phone information, and scroll down until you see a setting called ‘Set Preferred Network’ and select GSM/WCDMA/LTE (PRL) and turn off your phone and back On.
Now go to settings > Network & Internet> Mobile Network > Advanced > Preferred Network type and select LTE/GSM/UMTS
And it’s all done