text: import pyb
  
  # create one NB instance
  a = pyb.NB()
  
  # check NB register state
  # 0 - no register;  1 - registed, 2 - searching, 3 - denied, 4 - unknow, 5 - roaming
  print(a.state())
  
  # return imei
  print(a.imei())
  
  # return SIM card iccid
  print(a.iccid())
  
  # return cellinfo
  print(a.cellinfo())
  
  