Are there any health concerns with WiFi & 3G etc?

Science only, please ;)
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☠ MASQ ☠Commented:
Even by adding a rider for science only you'll get science that supports both a "yes" and "no" answer to your question.
In terms of relative safety the overall verdict remains "no".  Although adding any form of radiation to an environment increases risk the amount of radiation and its intensity is very low (in comparison with other natural sources)
A reasoned (and relatively humorous) take on it by the scientific community.
davidsperlingAuthor Commented:
This was a quite good page. Seems like it's bad for rats at least..
(linked from your link)
☠ MASQ ☠Commented:
But in the same way that if you give rats a human dose of saccharin they die so saccharin is poisonous - one of the subsequent posts does criticise the science in that paper.
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Robert Park's weekly column is in my Can't Miss category:

Cell phones and cancer (and power lines and cancer) are some of his more
regular topics unfortunately.

It is unfortunate that people continue to fail to get it.
NerdsOfTechTechnology ScientistCommented:
Wi-fi (2.4GHz) and 3G or HSDPA operates at 850 and 1900 Mhz likely pose insignificant danger to humans based on current power levels.

Since you are pointing toward "mobile phone" issues here is a great wiki on the matter:
according to the World health Organization:

Considering the very low exposure levels and research results collected to date, there is no convincing scientific evidence that the weak RF signals from base stations and wireless networks cause adverse health effects.
A simple way of looking at it is that 2.4GHz waves have a wavelength of 12.5 centimeters.  In order for radio antennas to pick up radio waves, they have to be at least a reasonable fraction of the size of the wavelength, like 1/4 or so.  So to pick up 2.4GHz waves you need an antenna at least 4cm long.

All the mechanisms of biological damage that people are talking about, bond breakage, dna mutation, etc., happen on scales that are at least 5 orders of magnitude smaller than that.  

Say you're in the ocean, assume you have a size of about 1 meter.  A wave with a wavelength of 100000 meters passes by you.  That's so slow  and spread-out that you're not going to even notice it.  

Here's another Wikipedia page that is highly relevant:
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