There is no clear evidence in the existing scientific literature that the use of mobile telephones poses a long-term public health hazard (although the possibility of a small risk cannot be ruled out).
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/mobile-telephones-and-health-effects
[2] http://admin.indiaenvironmentportal.org.in/category/publisher/australian-radiation-protection-and-nuclear-safety-agency
[3] http://admin.indiaenvironmentportal.org.in/thesaurus/mobile-phone
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/australia