These are the LTE bands straight from HTC's U11 websiteHTC U11 Unlocked Band Support
What US networks does the HTC U11 Unlocked edition work on?
The hardware for the unlocked HTC U11 will work fully on the following US LTE networks:
AT&TCellularOneConsumer CellularCricketGCI (Alaska)Good2GoMetroPCSNET 10Real MobileSimple MobileStraight TalkTelcel AmericaT-MobileTracFoneVoce WirelessWalMart Family Mobile
Additional carriers may be supported.
To confirm, check with your carrier to ensure the bands listed below are supported.
Unlocked devices usually don't support services such as Voice over LTE (VoLTE), Wi-Fi Calling, Mobile Hotspot and LTE Carrier Aggregation. Does the HTC U11 Unlocked edition support those services?
Yes, unlike other mobile phone manufacturers, HTC is proud to offer the best user experience to our customers. We support Voice Services over LTE (VoLTE), Wi-Fi Calling, Mobile Hotspot and Carrier Aggregation. Our HTC U11 has been built from the ground up for the North America customers and wireless networks. Some services may require the feature to be supported by your mobile operator before it will function on the HTC U11.
HTC U11 Unlocked Band Support
4G LTE (up to 600Mbps download speed/with 2CA, 3CA Carrier Aggregation and 256 QAM, service dependent): FDD: Bands B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B20/B25/B26/B28/B66 TDD: Bands B41 with 2CA, 3CA, 4CA Carrier Aggregation
3G UMTS: 900/850/AWS/1900/2100 (B8/B5/B4/B2/B1 with 900/850/AWS/1900/2100 diversity), HSDPA 42, HSUPA 5.76
2G/2.5G - GSM/GPRS/EDGE: 850/900/1800/1900 MHz