BY A STAFF REPORTER: Big Success of Kolkata STF. Acting on a source information, STF, West Bengal arrested three persons (which includes one Bangladeshi National) and Seized 18 SIM Boxes, more than 600 SIM cards, other accessories from six places for running international VoIP Call Routing Racket. Police told, They were in the illegal business of landing international telephone calls to India bypassing valid gateways. Police also said that the Raid is going on.