Bikaner, Oct. 23 -- The alleged mastermind behind cross-border arms smuggling operations that surfaced after a haul of weapons and suspected explosives was intercepted at Sri Ganganagar district on October 13 allegedly avoided a personal SIM card and instead used a digital proxy to evade detection, state Anti-Terrorism Squad (ATS) officers probing the case have said. The suspect, identified as Kulwant Singh alias Sukkha, remains absconding, even as three others linked to the case are in custody, said police. Investigators said that Singh used an internet-based calling app routed entirely through a mobile hotspot hosted by a co-conspirator. This technical workaround allowed him to coordinate deliveries. Additional superintendent of police (ATS) Surendra Kumar said the SIM card supplying the internet connection belonged to a Punjab resident identified as Gautam, who was arrested on Thursday. He added that investigators were examining the communication trail to establish how the connection was used and identify the people contacted through the application....