Galaxy S5 K Zoom unlocked only 3G in USA?

Active55

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Nov 9, 2014
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I'm considering the Samsung Galaxy S5 K Zoom with KitKat OS as a companion to my new Gear S watch phone here in the USA using the AT&T network. I see factory unlocked Zoom's on eBay in two forms, the C111(3G) and C115(LTE).

The sepcifications are:
2G Network: GSM 850 / 900 / 1800 / 1900 - SM-C111, SM-C115
3G Network: HSDPA 850 / 900 / 1900 / 2100 - SM-C111, SM-C115
4G Network: LTE 800 / 850 / 900 / 1800 / 2100 / 2600 - SM-C115

It looks like the 2G & 3G networks will work here in the USA on AT&T and T-Mobile, but I don't think the 4G LTE network will. Can someone tell me if that thought is correct?

This is what I know the USA 4G LTE metworks to be:

4G LTE AT&T 700/1700/1900/2100Mhz; 4G LTE Verizon 700/1700Mhz; 4G LTE T-Mobile USA 700/1700/1900Mhz; 4G LTE Sprint 800/1900/2500Mhz; 4G LTE MetroPCS 1700/2100Mhz; 4G LTE NewCore Wireless 1900Mhz; 4G LTE SRT Wireless 1900Mhz; 4G LTE U.S. Cellular 700/850/1900/2100Mhz; 4G LTE Adams Networks 700Mhz; 4G LTE AlaskaComm / GCI 1700Mhz; 4G LTE Big River Broadband 1700Mhz; 4G LTE Bluegrass Cellular 700Mhz; 4G LTE C Spire 1700/1900Mhz; 4G LTE Colorado Valley 700Mhz; 4G LTE ETC 700Mhz; 4G LTE Evolve Broadband 700Mhz; 4G LTE Fuego Wireless 700Mhz; 4G LTE miSpot 700Mhz; 4G LTE Mosaic Telecom 700/1700Mhz; 4G LTE Nex-Tech Wireless 700Mhz; 4G LTE Nortex 700Mhz; 4G LTE nTelos 1900Mhz; 4G LTE PTCI 700Mhz; 4G LTE Peoples Telephone Cooperative 700Mhz; 4G LTE Space Data Corporation 1700Mhz; 4G LTE Syringa 700Mhz4G LTE United Wireless 700Mhz; 4G LTE VTel 700Mhz

Only the 2100 frequency in common. Is that adequit to work?