The latest study on cellphones and cancer has found no increased risk - in line with a number of earlier studies.
The scope of the Danish study, published in Friday's British Medical Journal, is impressive but unlikely to end debate on whether cellphones are bad for the health.
Researchers followed more than 350,000 people who had a cellphone between 1987 and 1995 and determined the rate of brain tumors in subscribers wasn't higher than in those who didn't have a device.
Some experts said the Danish study bolsters the contention that casual cellphone use is harmless.
"This paper supports most other reports which do not find any detrimental effects of phone use under normal exposures," said Malcolm Sperrin, director of Medical Physics atBritain's Royal Berkshire Hospital, told Reuters.
Critics said the study was flawed because it didn't measure how much each person used their phone and it excluded corporate subscribers, who may have been the heaviest users in the 1990s.
The U.K. advocacy group Powerwatch also noted that people who didn't sign up for a phone until after 1995 were classified as "non-users" for the purpose of the study.
There have been contradictory findings and dueling studies for years on whether the radiation emitted by cellphones can breed tumors.
In May, the World Health Organization declared mobile phones a possible cancer trigger, lumping them in with coffee, booze and chloroform.
A month later, an international team of researchers debunked the cancer connection, saying there wasn't enough evidence.
Some advocates suggest that until it's clear whether cellphones cause cancer, people keep the phones away from their bodies and limit use by children