A PDCPHS phone has both PDC communication function and PHS communication function. Register storage requirements are reduced by producing the target value from a nominal voltage value and one of a plurality of margin offsets selected in accordance with control data. At least one battery service station is selected as destination point for determining the maximum operating range. The responses received for the head content from the plurality of users is filtered to generate a subset of the responses related to the location of the user. 25 fC\u03bcm and wherein the distribution is substantially unimodal and possesses a peak width of from about 0.