5G phones are to be subject to tougher radiation limits.
But the standards body behind the new rules says there is no evidence that mobile networks cause cancer or other illnesses.
It has spent several years reviewing scientific literature on the effects of exposure to electromagnetic fields.
It says the new guidelines will provide improved protection for forthcoming 5G technologies that use high frequencies.
It is the first time since 1998 that the guidelines on protecting humans from radiation from phone networks, wi-fi and Bluetooth have been updated.
The rules do not impose new limits on 5G phone masts, but rather concern the phones themselves.
They impose what are described as “more conservative limits” on radiation from handsets when they connect to higher-frequency 5G networks.
The changes focus on frequencies above 6 GHz. These are not used for 5G in the UK at the moment but could be in the future.