Phones don't radiate ionizing radiation, so they can't cause cancer. With most police officers having the radio antennas near their heads for the last 3 or 4 decades, most police deaths would have been due to cancer if radio waves caused cancer. (Cellphones transmit about 1/8 the power of police radios [or less - police radios transmit 5 Watts or more - cellphone output - when you're fr from the nearest tower - is only about 0.75 Watt], so would have 0.3 times the effect if they caused anything more than surface warming.)
There's been medical literature about the situation since the 1930s (radio was used as a means of diathermy since at least that far back).
The whole concept of SAR was invented to allay the fears of people who didn't know anything about the subject but connected the words "radiation" and "cancer" and needed reassurance that cellphones wouldn't cause cancer.
(One probable reason for the differences in the numbers are that the SAR is very different between 600MHz (Band 71) and 2100MHz (Band 66). It's a 3.5:1 frequency difference so, with nothing else considered, that's a 12.25:1 difference in absorption [with 2100MHz being absorbed less, since higher frequencies can't penetrate human skin as easily as lower frequencies].) You can't compare ducks and duct tape just because the names sound alike, but that's what you're doing - comparing 600MHz, 2100MHz and ionizing radiation (X-rays and Gamma rays). X-rays are electromagnetic radiation, the same as AM radio, cellphones and the light coming from a lightbulb. But you don't see SAR for lightbulbs because no one has started yelling about lightbulbs (or campfires - they also give off electromagnetic radiation - so does lightning - so do fireflies). SAR is strictly a marketing thing, it has no basis in reality.
Show one medical study, published in a peer-reviewed medical journal, showing a connection between light (which is a much higher frequency than cellphone radiation and penetrates skin a lot better) and cancer, and people who understand physics and biology will begin to take the whole thing seriously.