A financial transaction processing system in a legacy financial transaction network for wireless mobile handset devices having an internal SIM or USIM under control of a service provider in a wireless communication network connected to an open world communication network in which the SIM or USIM has a secure part of an account management application that manages a financial account in the handset and adjusts the financial account when the user of the handset communicates a number related to the mobile number of the handset to a legacy remote card terminal which routes the number and transaction data to the secure link server of the service provider.