The only personal data that we collect is your mobile number, so that MOH can contact you more quickly if you were in close proximity to a COVID-19 case.
With your consent, TraceTogether exchanges Bluetooth proximity data with nearby phones running the same app. This data is anonymised and encrypted, and does not reveal your identity or the other person's identity. In order to measure distance, information about the phone models and signal strength recorded is also shared, since different phone models transmit at different power.
All of this data is stored only on your phone, and not shared with MOH. Should MOH need the data for contact tracing, they will seek your consent to share it with them.
TraceTogether also collects anonymised app analytics data to improve the app across different phone models, and to provide a better experience to our users.