Honor 10 has the following LTE Bands:
Primary SIM card:
4G LTE TDD: B38/B40/B41
4G LTE FDD: B1/B3/B5/B7/B8/B19/B20
3G WCDMA: B1/B2/B5/B8/B6/B19
2G GSM: B2/B3/B5/B8
Secondary SIM card:
4G LTE TDD: B38/B40/B41
4G LTE FDD: B1/B3/B5/B7/B8/B19/B20
3G WCDMA: B1/B2/B5/B8/B6/B19
2G GSM: B2/B3/B5/B8
Datenservice: LTE TDD/LTE FDD/WCDMA/EDGE/GPRS
That's the answer of the german support chat.