AT command to get/set band

at!band=? //get all band supported by device
Index, Name,                      
00, All Bands,                   
01, LTE 1800, WCDMA 850/2100,    
02, WCDMA 850,                   
03, LTE 1800,

set a perticular band

at!band=2 // will set WCDMA 850 ( 3G band )