would you be under-utilising iphon5s since u are using a 3g sim card?
Sim card has NOTHING to do with that.
4G is a service, not a card function.... even my miniSIM since iPhone 3G era is 4G CAPABLE....
Whether your sim card can run 3g or LTE is all depend by the telco, they are the one lock the LTE. If u get a nano sim from telco, do not mean you will unlock the LTE for u, for M1, u need to pay to unlock the LTE, i think.
normal and macro sim means no 4G meh? then those s4/note2 how?would you be under-utilising iphon5s since u are using a 3g sim card?