List of AT+ZNLOCKBAND that I have tried so far. I will try other Band combination soon.
AT+ZNLOCKBAND
Band 1
AT+ZNLOCKBAND=1,0,1,0
Band 3
AT+ZNLOCKBAND=1,0,4,0
Band 5
AT+ZNLOCKBAND=1,0,10,0
Band 28
AT+ZNLOCKBAND=1,0,8000000,0
Band 40
AT+ZNLOCKBAND=1,0,8000000000,0
With Carrier Aggregation
Band 1/28 or Band 28/1
AT+ZNLOCKBAND=1,0,8000001,0
Band 1/3 or Band 3/1
AT+ZNLOCKBAND=1,0,5,0
Band 1/5 or Band 5/1
AT+ZNLOCKBAND=1,0,11,0
Band 3/5 or Band 5/3
AT+ZNLOCKBAND=1,0,14,0
Band 3/28 or Band 28/3
AT+ZNLOCKBAND=1,0,8000004,0