(Telecompaper) Telefonica has announced that its Central American customers will now be able to access data roaming at no additional cost in all countries in the region under a new service dubbed 'Movistar Sin Fronteras'. The regional data roaming service is available to all prepay and postpay consumer and business users in Costa Rica, El Salvador, Panama, Guatemala, Mexico and Venezuela. Any excess data consumed outside the user's country will also be charged at local rates. The company's move means that customers travelling throughout the region will be able to make calls using their data bundles via OTT apps such as WhatsApp and Viber.