Yes they do. Specifically, RF radiation reduces cells' oxidative state. i.e. they suffocate and die.
Ice samples show that our environment used to contain between 38% and 50% oxygen. Today, we have below 20% oxygen in our environment. At 7% oxygen levels, humans asphyxiate.
So we take that situation - which we've created - and then we add RF-emitting devices that further decrease cellular oxidation. i.e. suffocating (killing) our cells. With iPhone and Blackberries, we've gone from partial localized RF exposure to constant localized RF exposure (plus all the stupid bluetooth headsets that go with it).
All the studies that claim no connection between RF radiation and cell death have unrealistic study times. The cell phone industry gets a research team to study rats undergoing GSM modulation exposure for 24 hours and then hail the rather paltry results as evidence that cell phones don't cause cancer.
There are numerous studies that found connection between RF radiation and cell deoxidation and death, and even those weren't conducted over a timeframe necessary to reasonably recreate the typical human exposure over a number of years from regular cell/mobile phone use.
Here's just a few:
http://www.ncbi.nlm.nih.gov/pubmed/...ez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum
http://www.ncbi.nlm.nih.gov/pubmed/...ez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum
http://www.ncbi.nlm.nih.gov/pubmed/18044737?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DiscoveryPanel.Pubmed_Discovery_RA&linkpos=5&log$=relatedarticles&logdbfrom=pubmed
http://www.ncbi.nlm.nih.gov/pubmed/17624651?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DiscoveryPanel.Pubmed_Discovery_RA&linkpos=1&log$=relatedarticles&logdbfrom=pubmed
http://www.ncbi.nlm.nih.gov/pubmed/...ez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum
You seem awfully sure of your position, given there's just as much evidence demonstrating a connection as there is demonstrating no connection. Have you asked yourself: what are the intentions of the scientists behind these studies? I'm willing to bet there's a significantly higher incidence of money connection between the cell phone industry and the scientists in the "no cancer connection" group than there is between the cell phone industry and the scientists in the "cancer connection" group.
I'm also willing to bet my health and welfare on my position. Are you willing to bet your health on your position? Let's discuss in 15 years. If you tell me then there's no connection, I'm pretty sure you'll also be sucking down your healthy, manly-voiced Marlboros and insisting there's no global warming while your home town washes down the river.
Screw this cellphone - cancer stuff. No one has proven that daily cellphone usage gives you brain tumors. HOWEVER that doesn't mean you should wrap your iPhone next to your head and keep it there for 24/7. Common sense should tell you to avoid using it frequently for long periods of time and if you must do so, to use an earpiece.
To danvlarsen: Since you love making comparisons ("that's like saying I shouldn't keep beer in my fridge just cause I don't drink"???) I'll give you one of my own. If you are scared that iPhone is going to give you testicular/prostate cancer because you keep it in your pocket, don't ever go outside when it's sunny, you'll get skin cancer and scientists have already provided a definite proof of that.
Conclusion: Exercise common sense!