A1 Systems is a developer and service provider of integrated solutions for MNOs & MVNOs. Since 2008, A1 Systems empowers its telecom partners to: • provide high-profitable digital VAS; • increase revenue from their own and third-party services; • manage SIMs and eSIMs; • optimize roaming costs; • improve customer experience and loyalty; • monetize operator Big Data; • collaborate with government to secure citizens in emergency situations. Company’s innovative and high profitable digital VASs together with its unique marketing campaign management tool, big data analysis, contextual marketing communications and years of experience generates millions of dollars for A1 Systems’ telecom partners. Different kind of A1 Systems’ SIM applets works on more than on 140 million SIMs enabling MNOs & MVNOs to promote their voice-, data- and third-party services using high CTR interactive messages, to manage IMSIs, secure their subscribers and M2M data with electronic signature. A1 Systems’ engineers have successfully conducted more than 200 OTA campaign for 10+ mobile operators. Years of professional experience in cooperation with the leading telecom operators has formed strong competencies in developing and managing high-load and highly reliable systems that serves more than 2.5 billion transactions every month. Now A1 Systems cooperates with 20 mobile operators in various countries which total subscriber base is over 300 million.