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This requires a to completely trust people to carry along their cell phone ("oops I forgot it"), and to trust people carrying their OWN cell phone ("Let me visit some enemies with the cell phone of my coughing friend to make them go to quarantine as soon as my friend is tested positive").

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Touché on second point, but who forgets their phone these days, really? I haven’t forgotten mine ever that I can remember.

well, one may "forget" it on purpose to avoid being quarantined after seeing someone else who gets tested positive later on. This could be even used as a countermeasure to the second point above.

Another reason: "lets meet at a corona party, no cell phones permitted".

Good point. Hadn’t considered that.

As I understand this, the approach here is to bet on personal responsibility. This technology cannot be used to enforce quarantines as the authorities have no access to the data.

Basically, we have to stop 2/3 of infections to get an R<1. If 2/3 of the population use the app honestly and we keep up some other measures (no indoor events where people are in close contact, wearing masks while shopping, no visitors in nursing homes and hospitals, etc.) then this might be enough to contain the virus until we have a vaccine.

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