This is an era of technology where smartphones have become an integral part of our lives. While initially intended for easy communication, over the years various features have been incorporated into the smartphones. This has increased our dependency on them exponentially; to the extent that most of us are now addicted to them.
Mobile phones use radiofrequency waves for communication. These are non-ionizing radiation. Non-ionizing radiations do not possess enough energy to cause mutation (changes in the gene) unlike ionizing radiations and hence are deemed safe. However, in the year 2011, an international research linked mobile phone radiations to cancer. Since then, multiple researches have been conducted to check if cell phone usage indeed causes any cancer.
Results from these studies are inconsistent. While some have found a low but statistically significant risk of cancer associated with extensive mobile phone use, many others did not find any such link. Maybe more extensive research and case-studies could help to convincingly rule out or establish its cancer-causing potential.
So, to answer whether cell phone use causes cancer, we would say a 'No' for now. However, it must be noted that constant use of mobile phones interferes with the sleep pattern and lifestyle amongst those who're addicted to them. So, it is advisable to use them judiciously.