Absolutely.
I would disagree with this, because the normal operation of the WiFi card is somewhat away from your body. Likewise the garage door opener is normally some distance away from the body. The inverse square law actually applies here since you're outside of the (very small) nearfield area of the antenna.
Also, note the exposure time is different as well. Many folks spend hours a day on the phone.
What IS the current state of affairs on biological RF effects? When last I looked, there were high-intensity B field issues, but almost all the other biological effects had to do with tissue heating, RF burns, etc. As someone who used to have an office under a tower with tens of volts per meter squared, I was keeping pretty close watch on the research in the eighties but I haven't seen anything too recently.
scott
"C'est un Nagra. C'est suisse, et tres, tres precis."