Mobile phone users in San Francisco are to become the first in the world to be told by law how much radiation is emitted by their phone. The law has been changed to force companies to put signs in shops detailing the ‘specific absorption rate’ of each phone on sale.

The information would be similar to health warnings on fatty foods or cigarettes but the U.S. city is the first in the world to extend the concept to mobile phones. Despite exhaustive research, evidence on whether or not using a mobile phone causes cancer is inconclusive. Tech-savvy, health-worried: San Francsico, which earlier this month launched the latest iPhone at the Moscone Centre (above), voted for handset warning labels. Tech-savvy, health-worried: San Francsico, which earlier this month launched the latest iPhone at the Moscone Centre (above), voted for handset warning labels. American mobile phone companies have used this to attack San Francisco’s government and claim that putting such information at the point of sale will fool consumers into mistakenly thinking some phones are safer than others. Companies that breach the rules will face £200 fines.

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