PROTEI has proved demands for its MVNO-targeted solutions by implementing new project. The bundle had been delivered to new full MVNO in Moscow named SIM Telecom (brand SIM-SIM). As part of turn-key project PROTEI carried out delivery, deployment and integration with host operator all key MVNO network nodes such as STP, home location register (HLR + AUC), gateway mobile switching center (GMSC), including media gateways (MGW), SMS-center, data traffic control node (DPI) and a number of VAS-platforms. Thus, the network of SIM-telecom has been fully built using products and solutions of the St. Petersburg developer. A distinctive detail of this project is charging and billing infrastructure based on PROTEI charging solutions. The platform includes two network elements. The first one is CAMEL-gateway (SCP) already well-proven by many deployments including MegaFon. Second module is comprehensive real-time charging and billing system PROTEI OCS. PROTEI OCS includes all modules that are required for MVNO business such as charging module (supporting a variety of prepaid bundles, on-line charging, discounted rates ans so on), SIM-cards’ management module (inventory), payment gateway, unified provisioning gateway for managing MVNO network elements during service activation/deactivation procedures. The platform is integrated with several payment systems that will ensure comfort and flexibility for MVNO subscribers when recharging their accounts.