On the weekend, I tweeted about how ABTraceTogether doesn't work correctly between iPhones. @SteveBuick2 told me I was wrong.

I tested it.

It doesn't work in the background, iPhone/iPhone. Doesn't work consistently iPhone/Android, either. https://docs.google.com/document/d/1zm7zskUOI6ie2rBLl6dAq07_cQeMVoDhpGUunKZ33CM/edit#
2020-11-11 - ABTraceTogether iPhone Background Capability Analysis

ABTraceTogether iPhone Background Capability Analysis Author: Mathieu Fenniak; Software Engineering Manager Collaborator and iPhone contributor: Amanda Fenniak 😘 Overview ABTraceTogether is an...

https://docs.google.com/document/d/1zm7zskUOI6ie2rBLl6dAq07_cQeMVoDhpGUunKZ33CM/edit#
iPhone/iPhone: In over 12 hours of close exposure between two iPhones with ABTraceTogether in the background, zero records of exposure were recorded. After bringing the app into the foreground on one iPhone, exposure records began being collected immediately.
Android/iPhone: While some exposure was recorded while both devices were in the background, it did not occur consistently w/ physical exposure. One hour of physical exposure is more than sufficient to contract COVID-19, but did not trigger ABTraceTogether's exposure recording.
You can follow @mfenniak.
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