http://www.sitefinder.radio.gov.uk/home.htm

The 'Sitefinder' Mobile Phone Base Station Database is a national database of mobile phone base stations and their emissions. The database is managed by the Office Of Communications. Ofcom have produced an information sheet providing background information on the Sitefinder database and how to use the resource.

Ofcom is not responsible for planning or health issues relating to mobile phone base stations and masts. For details of the appropriate contacts within Government for general enquiries relating to these issues go to the related sites area.

All efforts have been made to ensure that the information provided on the database is as accurate as possible. However, Ofcom cannot accept liability for inaccuracies in the data or map information provided.

I work on towers. I am on or around them nearly every day.
I have a personal RF Hazard Warning Device which I wear on the outside of my clothing. This gives me an audible warning when I am exposed to the accepted MAXIMUM SAFE RF LEVEL (ie. I am still 'safe' if the alarm sounds, but a retreat is in order until the source can be identified).
I would like everybody who reads this to know that my RF warning device has NEVER REGISTERED MORE THAN 25% OF MAX SAFE LEVEL, even in ridiculously close proximity to operational 2G & 3G Antennas.
Not exactly conclusive scientific evidence but that is my experience.
A lot of the stuff I read or hear about 'Masts' is factually incorrect, in my experience.

For what it's worth, I reckon that the mobile phone now offers the most usefull Activist / Anti tool ever. You can very discreetly record high quality sound, video or still images, send to others, contact large groups of people quickly via text and mostly without anybody really knowing who or where you are.

Who sets the 'maximum safety levels'? I think you'll find the same authorities who've in this country spent much money reviewing the safety of mobile phones, and, er, they're safe - eat your dinner off of 'em and you'll get brainier. Ignore all the contradictory reports on their dangers, and feel safe and anonymous as you say... In fact, forget tagging, mobile phones are your own personal tracking device, which can be used to pinpoint your whereabouts at all times. Phone companies now have to store this info of everywhere you go with your mobile for 7 years, since the government changed relevant laws. Yum, I think I'll feed them to my children to prove how safe they are (or was that burgers, Gummer...?)!!