B4: AT+QCFG="band",0,8 B5: AT+QCFG="band",0,10 B7: AT+QCFG="band",0,40 B28: AT+QCFG="band",0,8000000
AT+QCFG="band",0,8
AT+QCFG="band",0,10
AT+QCFG="band",0,40
AT+QCFG="band",0,8000000
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