Phone (2a) is compatible with 5G which include these bands:
5G NR band
sn1, n3, n5, n7, n8, n20, n28, n38, n40, n41, n66, n77, n78
4G LTE bands
1, 3, 4, 5, 7, 8, 18, 19, 20, 26, 28, 38, 39, 40, 41, 42, 66
3G UMTS (WCDMA) bands
1, 4, 5, 6, 8, 19
2G GSM
850/900/1800/1900
