Mobile phone giant Motorola has rubbished a new invention which promises to block 90% of radiation from cell phones.
They've dismissed the ultra-light magnetic composite film developed by Hong Kong scientists - despite growing public concern over the safety of mobile phones.
A spokesman for Motorola has rejected claims that the material could be used to shield mobile phone users from radiation without interfering with transmission quality.
He added: "If you were to put such a device between a mobile phone and its base station it would tell the phone to boost its power.
"This would lead to a compromise in signal quality and and significant drain on the phone's battery.
"Mobile phones emit tiny levels of radiation and there is no scientific evidence for any adverse effects on their users."
But in December last year the government launched an intensive leaflet campaign warning of possible health risks surrounding the use of mobile phones.
Research into the phones has been bedeviled by inconclusive experiments and conflicting results.
There have been claims that hands-free sets could lead to lower radiation exposure, and counter-claims that they could lead to higher exposure.