Bulgarian mobile broadband provider MAX (previously Max Telecom) has launched voice services over its LTE network, using over-the-top (OTT) software application called ‘Voicer’. The pre-paid application could be used with a MAX SIM card or with a mobile number ported from another Bulgarian operator; the starter pack comes with 1GB of data and unlimited calls within the Voicer network and costs BGN5.0 (USD2.9). Calls to other mobile and fixed networks, meanwhile, cost BGN0.05 per minute, though the operator said that it will use per-second billing. Voicer can be used on up to five devices from one user (with one mobile number) regardless of the type of internet connection – 3G, 4G or Wi-Fi. MAX’s CEO Neycho Velichkov said: ‘We have introduced a revolutionary product that uses our technology capabilities to provide an innovative next generation voice, video and texting service, the first of its kind on the market. We also offer something that no other mobile operator on the market does – voice calls charged by the second, thus providing transparent and fair treatment of each customer.’ Going forward, MAX is planning to start offering services over market leader MobilTel’s (M-Tel’s) networks from the start of next year, following the signing of a landmark contract for national roaming services between the two companies in July 2015.