Whats the difference between cell phone and data radiation
They are all electromagnetic waves with different wavelengths. There had been no scientific evidence that they're dangerous in the power level used in common appliances, and many researches shows no evidence of danger in the short term studies, however many countries adopts the precautionary approach and advises people to minimize exposure just in case since long term study and study in  children has not been conclusive yet (these kind of studies takes a very long time since they follow their subjects for decades), although preliminary results suggests that long term effect may also be of no danger. 

You're probably more likely to be killed in a car accident then getting a cancer due to mobile phone radiation.