No wisecracks but I DON'T worry about magnetic fields from 60 Hz wiring OR microwaves from cell phones (which are quite different). IMO no reliable, repeatable scientific evidence in either case.
The magnetic fields from 60 Hz are mostly negated by the two wires that complete the circuit being close together, as in house wiring. That is the current in each wire is equal and opposite in direction, and cancel out the magnetic fields. Most concern is due to high voltage utility wires where they separate the wires on the pole for insulation/safety. This canceling out makes the field very small once you are farther from the wires than they are apart, so a few inches for Romex. As for shielding the little 60 Hz field that is left....very difficult. Lead or burial in soil will NOT do it. Of course, the 'two wires near each other' thing is not true in your breaker box, where the hot and neutral wires can be a few inches apart. I expect the field would extend proportionally further away than from wall wiring.
As for the cellphones, wifi and wireless phone...different animal. Like food in the microwave, they penetrate a ways, but not too far into tissue. In other words, most heats your scalp (very slightly) but not your brain. The brain generates a ton of heat by itself, so has a lot of blood flow to both feed it and to keep it cool. Maybe 20-30 watts equivalent heating and cooling. What is a fraction of a watt from a cell phone going to do, with blood flow carrying the heat away? Studies I have seen show that this (small) heating effect is greatest by far for smart phones and cell phones held to the ear (smart being slightly worse). This is about power and distance. Cell phones need to be powerful to reach the phone tower a half mile away, and then they are right on your ear. Wireless phones and wifi circuits are a tenth as powerful, because they don't need to reach the same range. And the wifi in your laptop is a couple feet from your head, rather than a couple inches, making the heating effect a hundredth as powerful again. So, if you are worried about it, all you need to do is use those earbuds with a mike on your cell phone, and carry the phone in your pocket or purse. That reduces your exposure 90% or more, and everything else you listed is very minor.
So, to repeat, I am talking about minimizing exposure, b/c that is what you asked about. Studies have NOT shown any increase in cancer due to cell phone use (which would be localized near the right or left ear depending on user habits) at all. Nor do very thorough studies on animals that use bigger doses and durations.
If you worry about cancer, and where it comes from its caused by other stuff. A century ago, the biggest cancer was stomach cancer, which fell off once refrigerators became popular...before that most meat was cured, and the huge amount of curatives ingested caused stomach cancer. Lung cancer is caused by smoking, and follows smoking rates. Liver cancer is caused by liver damage from alcohol, occupation exposure to chemicals (like dry cleaning fluid) and viruses like hepatitis. Cervical cancer is caused by HPV, and there's a vaccine. Skin cancer is caused by the sun, etc.
Right now, a lot of the other cancers are decreasing in frequency. Most of those others were probably caused by indoor and outdoor air pollution of different kinds, reduced over the last couple decades by the EPA. The biggest culprit was benzene in gasoline, which has been reduced by 75% or more in the last 20 years (but is not yet gone). Indoor VOCs like formaldehyde in furniture were probably pretty bad too, now much reduced. Some foods contain carcinogenic toxins in small amounts...but we're getting into the weeds. Pesticide residue in foods....no good evidence for cancer...and some organic foods have higher toxin levels than regular.
It appears that (age corrected) cancer rates we see in the US today are about 2-3X higher than people experienced centuries ago, and will likely decline back to that as we identify pollutants and remove them by regulation. But again, no careful, repeated electromagnetic field studies have seen an effect.
