The former army officer, Captain DK Giri along with another person was arrested a week ago.
Police said there were allegedly involved in the illegal procurement and sale of call detail records (CDRs).
This is the third major breakthrough within two months.
The Delhi Police had busted the racket on July 19 by arresting four people, including two owners of detective agencies, one police official and one expert hacker, who used to work with the Jaipur police.
The four were identified as Aniket Prakash Dhamle, 25, a resident of Pune, and Abhinav Kumar, 35, a resident of Mumbai - both ran detective agencies; Gajraj Singh, 23, a student and hacker, who had been assisting the Jaipur police's Cyber Crime Cell officers since 2013; and an officer of the Jaipur police cyber crime cell, Mukesh Kumar Meena, 38.
On July 10, the Delhi Police had also cracked an inter-state gang involved in illegally getting CDRs and then selling these to various people, mainly detective agencies.
Five people -- Uttar Pradesh police constable Narender; Jaiveer Singh Rathore, 46; Pankaj Tiwari, 26; Aditya Sharma, 32; and Sanjeev Chaudhary, 42 -- were arrested for illegally obtaining CDRs.