In August of 2006, Arbitron began telephone recruitment of a 2040 person Portable People Meter (PPM) ratings panel for the Philadelphia Metro market area. The PPM is a passive electronic measurement device that panel members wear during their doily routine. The PPM picks up encoded audio signals and transfers that data bock to Arbitron for further analysis. This data is used to create radio ratings for a particular market. Traditionally, Arbitron uses o landline based sample frame from which to receive diary keepers for the established ratings service. However, the potential for coverage bias due to the growing number of cell phone only households led to the inclusion of cell only households within this new PPM panel. The recruitment of this panel marks the first time that Arbitron has employed the use of a cell phone only frame to supplement the traditional landline sample frame. The supplementation of the landline frame with cell phone only households aids in the inclusion of certain demographics that may be harder to reach using the traditional landline frame. This paper first discusses the differences between the landline and cell phone only methodologies. Further analyses are also presented which examine the differences in the demographic makeup of the portion of the panel that was recruited via landline sample and the portion recruited from cell phone only sample. Finally, the radio ratings for both groups will be compared and examined for any differences.