On 28/04/2021 23:28, Andy Burns wrote:
Max Demian wrote:

It's because the developer had the latest phone/software.

The NHS covid app requires bluetooth "low energy" (BLE) capability
introduced in android 6 (marshmallow) but not all phones had the
hardware for it.

Since Bluetooth wasn't designed to determine separation between phones I
doubt it would be much good for the purpose of tracing. And the signal
goes through solid objects that viruses can't

--
Max Demian