hi doctor hope u r fine i hv been using cellphone since 5 years and when i used to use for a long i used experience vibration on the outer side of the ear till the brain.But due to ignorance i couldnt understand it and went on using.A year back due to some of my personal problem i had to frequently consult my mother on cell phone so i had to used it .but later whenever i used to talk for half an hour or so to solve my problem i used to experience pain in my ear.