Add new comment

Al's picture

Hi Paul,

Red marks a cell tower with unknown signal strength
Blue circles show a tower with it's strength (larger = higher signal level)
Yellow marks cached towers (ones that the phone has previously found)

An orange circle is a combination of red (unknown strength) and yellow (a previous detection). This could mean that there are two transmitters on the same tower (there are usually a few) or the transmitter has been changed and the old one is showing as yellow.