Instead of using a dedicated app, the system collected tracking information from a variety of sources, including mobile device and card transaction tracking data, which they then combined to send warnings by SMS to potentially infected people.
Badala ya kutumia programu moja, mfumo ulikusanya maelezo ya utafutaji kutoka kwa vyanzo anuwai ikiwemo data ya utafutaji wa kifaa cha mkononi na data ya manunuzi ya kadi, na kujumuisha hizi kutoa arifa kupitia ujumbe wa maandishi kwa watu wanaoweza kuwa wameambukizwa.