A system and method for managing the storage of data in non-volatile memory is described. Assays are carried out by transporting the sample through the channel to each successive binding partner so that target analyte present in said sample binds to the corresponding binding partner. An application on the mobile phone uses the data network to automatically request and receive the substitute termination number, and automatically sets up a call on the telephone network to the substitute termination number, which routes the call to the desired international telephone number.