Hypersynergy

Hey! So me and a friend were having an argument: Do cellphones cause cancer as a result of the radiation? I remember hearing somewhere, true or not, that a single Xray exam will give you more radiation than a cellphone will in your entire life. If this were true, it could be used as an argument, but i had to crunch numbers to be sure. So I found how much radiation comes from different cellphone units, which is in W/kg http://www.cnn.com/interactive/2011/06/tech/table.phone.radiation/index.html (This post says the most legal amount is 1.6 W/kg, so lets do worst case) Then I found the radiation in an Xray, measured in mSv http://www.radiologyinfo.org/en/info.cfm?pg=safety-xray Great. So now I had 1.6 W/kg cellphone 10 mSv XRay But to properly compare them, I need to convert them to a common unit. Lets use mSv http://www.translatorscafe.com/cafe/EN/units-converter/radiation/20-22/watt%2Fkilogram-millisievert%2Fyear/ 50492160000!? Woah okay, this seems wrong. So after browsing the internet for a bit I found the gray scale https://en.wikipedia.org/wiki/Gray_(unit) This is an exact amount of radiation, taking in no other context or variables. (I think) So, lets use this as the common unit using the same converter as before. These are my results: 1.6 Gray cellphone 3.168 Gray Xray Great! So, what do these numbers mean? This is where I fall short and help is needed! I'm not really sure what these numbers mean, and need help. If you can provide answers, please do! -Hypersynergy