Sure! ..the value does seem really insignificant and minuscule relative to other more common sources of radiations. But make no mistake though! ..little drops of water could and would eventually create an ocean someday. Afterall, from my knowledge on the subject it isn't like after a phone call all the seemingly "negligible amount" of radiation emitted simply dissipates into thin air. Remember the emphasis is on constant exposure and not just a one time experience thing. Hence, there could be an accumulative effect in the long term.
But who really knows? I guess this present generation would only have to wait some 10 to 15years or even more to discover the real truth.
RE: Could Radiation From Our Mobile Devices Kill Us? The Untold Truth About Cell Phone Radiation