Default Will any of the korean G2 ( with microSD ) work on UMTS Band 4 ( 1700/2100 ) AWS?

I'm interested in getting the Korean releases of the LG G2 simply for the MicroSD option.
I would like to clarify if any of them will work with UMTS Band 4 1700/2100 AWS ( T-Mobile, Wind, Mobilicity.. etc ) in North America

I've done a search but couldn't see any concrete confirmations.
Is cross flashing possible to attain such results?