Does cell phone radiation promote longevity?
If you read the discussion, and also the full contents of the PDF which include some reviewer comments, there is concern about the control group:


  The survival of the control group of male rats in the current study (28%) was relatively low
  compared to other recent NTP studies in Hsd:Sprague Dawley® SD® (Harlan) rats (average 47%, range 24-72%).


Specifically, the control group had an abnormally high mortality rate for that strain of rat. There is no increase in longevity if you compare to historical data.