The obsession with an app to deliver a tracing/contact system is ridiculous. Obviously it's an opportunity for people to make loads of money, but it was never going to work and people have been saying that from the start. Not only are there technological difficulties, but the important issue is that people are contacted quickly and persuaded to self-isolate. This might involve having to be absent from work, not being able to care for family members and all sorts of difficulties. Humans, who actually know their areas, are more likely to be able to persuade people to do that than an anonymous text or phone call. Local authorities have been saying all along that they could mobilise people with experience in that kind of work to be contact tracers, but the government just hasn't been listening.
Meanwhile, we have to wait until transmission rates come down, which means that more of us are having to stay at home if we care about our own health.