As of 6 December, there are at least two groups of possible Indian collaborators being investigated.out of which second part is Sim card suppliers-:
Two Indian men were arrested in Kolkata on 6 Dec for illegally buying mobile phone cards used by the gunmen in the Mumbai attacks. It is not known whether the two had advance knowledge of the attacks.Tauseef Rahman allegedly bought SIM cards by providing fake documents, including identification cards of dead people, and sold them to Mukhtar Ahmed.Ahmed is suspected to be an undercover policeman based in Srinagar.
Tausif Rehman, Muktar Ahmed - Under arrest in India - On 6 December 2008, two men were arrested in Calcutta, India, in connection with the Mumbai attacks, charged with conspiracy and forgery. These two men were being questioned in connection with selling of 22 cell phone Subscriber Identity Module (SIM) cards to the Mumbai attackers.One of the men was said to be from West Bengal and the other was from Indian-controlled Kashmir. The Kashmiri suspect was at first believed to be a police officer. Later the two men were identified as Tausif Rehman, a clerk from Howrah Station, and Mukhtar Ahmed, an auto-rickshaw (three-wheel taxi) driver of Kolkata. Rehman used the identity documents of a dead relative to acquire the SIM cards, and later sold the cards to Ahmed.