Poland’s largest discount supermarket chain, Biedronka, will start a MVNO service this week. Biedronka plans to sell SIM and prepaid cards under the tuBiedronka brand, leveraging PTC’s infrastructure, writes the Warsaw Business Journal. Service subscription fee is PLN 7.99, while calls to other operators will be charged PLN 0.33 per minute. Owned by Portugese capital group Jeronimo Martins, Biedronka is the second supermarket operator in Poland to launch an MVNO service. French chain Carrefour has also launched MVNO operations in April 2008, under the Mova brand name. MVNOs have a market share of 1 percent of the overall mobile telephony sector in Poland .