www.WirelessFederation.com/news: Vectone, MNVNO based in UK, has introduced  a calling card dubbed as ‘ZeroZero’.  A pre-paid, call routing gadget is the one that gives subscribers an option to make international calls from their mobile at calling card rate. ZeroZero fits between the subscriber’s mobile phone and the existing SIM card and recognises when the user dials an international number. The gadget routes the call through a local access number and uses Vectone’s low cost international network to make the call at a fraction of the price of a standard direct dial international call from a mobile. MVNO, anticipates that this calling card will attract contract subscriber with free minutes in their bundle to use them in conjunction with ZeroZero to get low rate international calls. This card requires a one off installation and can then be topped up through retail outlets such as Epay or Payzone, direct through IVR from the subscriber’s handset, or online.