[mikester]

802.11a is on the 5Ghz band

802.11b & G are both on the 2.8Ghz band.

If your friends phone is causing him problems with his wireless have him change the channel his wireless is operating on. There are 11 to choose from.

Most folks leave their wireless operating on the channel it came out of box on. This is the cause of most wireless problems as everyone in the neighborhood will be on the same channel (6 or 11 typically). Channels 1, 6 and 11 are the only ones that do not overlap in the b&g spectrum. All of A's channels are independant but A cannot cover as large an area.