PPMs not being carried


Regarding PPMs not being carried by their survey participants during their (up to 2 years) survey period, why not build them into a cell phone system and offer free cell service to the user (free in-coming or up to 1000 mins. a month etc) as the "premium." Could either be the usual cash incentive or cell phone service equivalent each month. That keeps the respondent more willing to carry the PPM-(Cell phone) in his/her possession. Still beats the retrieval and fill-in data fiasco of a mechanical diary. Check out the refusal rates, premium payments for certain Demographics and weighted diary counts already in progress.
Jerry Smith
Jacksonville Florida