Traditional RDD samples miss more than 10% of adults and even higher percentages of young adults who are cell-phone only. While interviewing of cell-only respondents is feasible, it is both costly and time-consuming. Survey researchers are examining ways of cost effectively identifying and interviewing these missing population segments. Abt/SRBI explored the effectiveness of one possible solution: establishing a panel of consenting cell phone only respondents by recruiting them via internet in order to use it as a supplement to RDD samples. Abt/SRBI used Sampling International (SSI) Internet database for this effort. The design compares these SSI cell-only Internet panelists with responses from surveys which incorporated RDD cell onlies to determine the representativeness of the recruited SSI Internet panelists. The survey instrument used existing questions from two sources, National Center for Health Statistics (NCHS) and Pew Research Center surveys. Both NCHS and Pew had previously collected cell phone only data and were used as sample comparisons for the Abt/SRBI panel. A total of 300 interviews were completed by Internet from October 15 – 25, 2007. Quotas were set for the Abt/SRBI panel by the age categories. Once 300 completes were attained, the Abt/SRBI panel was weighted by age and gender using NCHS cell only data. Comparisons are now being made between NCHS data, Pew data, and the SSI Internet Panel to determine the extent to which the cell only Internet panelists compare to NCHS and Pew data. SSI panel participants are being compared to the NCHS and Pew data on a variety of general opinion questions including: satisfaction with the way things are going in the country, satisfaction with your personal life, health status, religious service attendance, the importance of religion, party identification as well as smoking habits. Significance testing is ongoing. We may expand the panel size for the conference presentation.