You're suffering from "transistor at the end of a wire aerial"

Magnets (particularly stationary ones) will have no effect on a wire with no current.. when current passes through them, the wire will try to move in the magnetic field.. this is how motors work.. it is not going to cause a problem with a keyboard.

The "duh-d-d-duh-d-d-duh-d-d-duh" sound people may recall hearing from speakers when GSM phones were nearby is caused by poor filtering on the speakers.. interference is picked up by speaker wire/audio cable/whatever.. .Since GSM (and 3G) transmitters pulse on and off rapidly, this makes it harder to filter.. Here's an example:

a 100W FM transmitter next to a 1995 TV wouldn't necessarily cause any problems because the radio signal is of a constant strength.. However, turn the transmitter on, you get a snap of interference.. turn it back off, again another snap..

This is the same thing that causes clicks on the TV screen when your refrigerator motor turns on / off..

It is CHANGE that causes the problems like this.. and a GSM transmitter is constantly turning on and off..

Speakers (more accurately amplifiers) and TVs are immune to this NOW because the filters got better..


Your keyboard may not be sufficiently filtered for a) a pulsating radio source like the phone, or b) for a constant but high frequency transmission.. Either way, this is going to be rare and doesn't indicate a problem with anything other than your keyboard..

It won't have any affect on a human because we're not subject to interference, we're affected by absorbtion.. that's very different.