Samsung Galaxy S21 Ultra 5G Bands

2G B2 (1900), B3 (1800), B5 (850), B8 (900)
3G B1 (2100), B2 (1900), B4 (1700/2100), B5 (850), B8 (900)
4G B1 (2100), B2 (1900), B3 (1800), B4 (1700/2100), B5 (850), B7 (2600), B8 (900), B12 (700), B13 (700), B14 (700), B18 (800), B19 (800), B20 (800), B25 (1900), B26 (850), B28 (700), B29 (700), B30 (2300), B34 (2000), B38 (2600), B39 (1900), B40 (2300), B41 (2500), B46 (5200), B48 (3800), B66 (1700/2100), B71 (600)
5G N1 (2100), N2 (1900), N3 (1800), N5 (850), N7 (2600), N8 (900), N28 (700), N40 (2300), N41 (2500), N66 (1700), N71 (600), N77 (3700), N78 (3500), N79 (4700), N260 (39GHz), N261 (28GHz)

Coverage in Slovakia

2G B3 (1800)
3G B1 (2100)
4G B3 (1800)B7 (2600)B20 (800)
5G No

Operators of Slovakia

2G 3G 4G 5G
O2 B3 (1800)B8 (900) B1 (2100) B3 (1800)B20 (800) No
Orange B3 (1800)B8 (900) B1 (2100) B7 (2600)B20 (800) No
Slovak Telekom B3 (1800)B8 (900) B1 (2100) B3 (1800)B7 (2600)B20 (800) No
SWAN 4KA B3 (1800) B1 (2100) B3 (1800) No