Cliff Stoll writes: "The Times of India reports that cell phone SIM cards used by the terrorists in Mumbai were purchased in Kolkata (Calcutta), using fraudulent papers. The papers belonged to the dead uncle of a 26 year old man living in Kolkata; he is suspected of being a collaborator of the terrorists. The paper states that this highlights "the continued vulnerabilities in the system which have repeatedly been exploited by the terrorists and their collaborators to obtain cell phone connections. "We've booked them for cheating and forgery as they produced fake documents to get the SIMs. We've also slapped conspiracy charges against them for they had an ulterior motive. The arrests will throw light on the Mumbai terror module," Kolkata police's Jawed Shamim said."