No signal & low battery 

month
2012 2013
  • January
  • February 4
  • March 83
  • April 167
  • May 88
  • June
  • July
  • August
  • September
  • October
  • November
  • December
2011 2012 2013
  • January 37
  • February 74
  • March 71
  • April 41
  • May 35
  • June 37
  • July 31
  • August 13
  • September 1
  • October 5
  • November 154
  • December 19
2011 2012
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October 39
  • November 1
  • December 47