Between your handset and the base station, when your handset is active the vast majority of RF power going through you is from your own handset. I'm not sure i

Between your handset and the base station, when your handset is active the vast majority of RF power going through you is from your own handset. I'm not sure if it's still the majority on average when your handset is idling, but I suspect it still is on the whole. I also suspect when walking around a dense urban centre that the handsets of other people nearby (in combination) also provide more RF than the base station. In locations where there is a poorer signal, personal RF exposure is likely to be higher, as the handset transmits at a higher power level to be "heard" by the base station far away. Counter-intuitively, this means where people successfully campaign to remove a mobile mast in order to reduce RF exposure, people's RF exposure can actually increase in a halo region around where the mast was, though decrease closer to where the mast was. For people who really want to reduce ambient mobile RF exposure, they need to campaign for all people in their neighbourhood to turn off their handsets (and for the remaining people who don't to not use all the freed up bandwidth). That's a tough thing to achieve though.