Possible but no solid scientific proof to link such radiation with cancer, as per stated in the same article you quoted.
Besides, you are exposed to radiation from far more powerful sources (e.g. the Sun) and human has been evolved to survive well within that kind of radiation, and cellphone radiation is nowhere near that level.
It is more meaningful to stay far and far away from radiation contaminated areas than worrying about a phone that might cause you cancer. Let’s not to mention everyone needs a phone of sort to even do anything meaningful in modern world we live in.