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13 A p p e n d i x B Sample Cell Phone Data Availability Table ID Available Start Available End Type Carrier Source 1234 1/1/2010 12/31/2010 Text Verizon Carrier 1234 1/1/2010 12/31/2010 Call Verizon Carrier 5678 6/1/2010 8/1/2010 Call T-Mobile Participant 5678 6/1/2010 8/1/2010 Text T-Mobile Participant 5678 6/1/2010 8/1/2010 Picture/Video T-Mobile Participant 9876 1/1/2011 12/31/2011 Call Sprint Participant