Need help with LTE Band SMN-900S Skt topic

Hi, first of all sorry for my bad english. I'm new in this forum and I have a question if some1 can help me. I'm from argentina and I have a Note 3 Smn-900S Skt, and I can't make it work the 4g band. My cellphone works in the LTE 850/1800/MHZ band, and I need the 1700/2100 band. Is there any way to change the frequency band in my phone?. If any1 can help me or guide me to a post to solve it plz let me know.

Thxs a lot!!!