Determining a mobile operator for a mobile device. The mobile operator is determined using one or more of an international mobile subscriber identity (IMSI) and a current operator name (CON) and service provider name (SPN) pair. Correlations between the IMSI and mobile operators, and between the CON/SPN pairs and mobile operators, are maintained. Correlations between unrecognized CON/SPN pairs and mobile operators are created based on a quantity of requests received from the mobile devices. In some embodiments, identifying the mobile operator enables financial transactions by the mobile device when visiting, for example, a mobile applications store.