Iphone 5s Models : A1533(GSM) vs. A1457
What is the difference between the A1533 model used mainly in the US and the A1457 model used in other countries? Can I use the A1533 in Vietnam or Brazil, where the A1457 is mainly used?
iPhone 5s
LTE support. Read here:
https://www.apple.com/iphone/LTE/
While both will work on GSM carriers, they will only support LTE in the countries they were designed to be used in.