Never noticed any GFCI tripping from Radio transmission - but did notice other stuff acting wierd!
When doing site surveys, our two-way FM Radios would cause Lexmark Imapct Printers to do a "Carrage Return" (run to end of line, then line up on next line).
This would occur if radio transmissions were done within 5 feet of the Printer.
Distortion on SVGA Monitors would occur within the same proximity.
As for the Nextel Cell Phones, My i1000 plus will cause interference on many different things - in either the "Direct Connect" radio mode, or in the normal "Phone" mode.
If the unit is within 5 feet of my "Workstation with Audio", you can hear all kinds of pulsed noise.
Pulses of various length occur every few minutes (when there is any refresh of location or such), and just prior to a call coming in, there will be a pulse train of like 10 pulses just before the ringer starts, or the radio alert starts.
Pulses can be seen flying across Monitors also.
Using either function while a VHS tape is playing - and within 10 feet of the VCR, will cause tracking errors and blows out the tape speed tracking functions (SLP slips to SP for about 100 ms).
This also appears to distort the CRT with pulsed interference (when no tape is played).
So far, no other cellular units have caused this interference (other than Motorola / Nextel). Our friends' Nokia Phones have little - if no interference, as compared to the Nextel / Motorola units.
Knowing this - and the past experiences with the Lexmark Printers, I keep away from IT equipment when using the cell phone / radio, and with the two-way radios.
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!