Radiation emissions from mobile phones will have to be disclosed by manufacturers to US consumers in three to six months' time.
This follows new guidelines being imposed in August by the Washington-based Cellular Telecommunications Industry Association.
All mobile phone manufacturers will have to report the radiation reading - or Specific Absorption Rate - which is a measure of the amount of radiation to which the body is subjected while using a mobile handset.
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UK research caused controversy in May when scientists reported there was currently no health risk from phone handsets, but that research in future might contradict this.