Google Pixel 4a 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), B17 (700), B18 (800), B20 (800), B25 (1900), B26 (850), B28 (700), B29 (700), B30 (2300), B38 (2600), B39 (1900), B40 (2300), B41 (2500), B66 (1700/2100), B71 (600)
5G No

Coverage in Japan

2G No
3G B1 (2100)B8 (900)B9 (1800)B11 (1500)B19 (800)
4G B1 (2100)B3 (1800)B8 (900)B9 (1800)B11 (1500)B18 (800)B19 (800)B21 (1500)B28 (700)B41 (2500)B42 (3500)
5G N77 (3700)N257 (28GHz)

Operators of Japan

2G 3G 4G 5G
KDDI au No No B1 (2100)B11 (1500)B18 (800)B28 (700)B41 (2500)B42 (3500) N77 (3700)N257 (28GHz)
NTT Docomo No B1 (2100)B9 (1800)B19 (800) B1 (2100)B3 (1800)B9 (1800)B19 (800)B21 (1500)B28 (700)B42 (3500) N77 (3700)N257 (28GHz)
Softbank No B1 (2100)B8 (900)B11 (1500) B1 (2100)B3 (1800)B8 (900)B11 (1500)B28 (700)B41 (2500)B42 (3500) N77 (3700)N257 (28GHz)