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- Caller ID: PRODUCT DEV
- 2008-12-11 12:30 (The Hypertwins) Called our Vonage line
- CallFerret "According to the submitted calls and comments, 1-303-280-8689 belongs to Product Development Corporation, a Phone Survey / Market Research Company."
- WhoCallsMe has several encounters logged
- WhoCalled.US has many encounters logged
- Google has many more hits for this number (as of 2008-12-11)