A couple still report issues adding their number after 6pm.

Thanks for the many messages, here is another selection of reader reactions:

Jacob Ijdo: I am a physician. We have COVID-19 patients in the hospital. I am concerned that many doctors, taking care of COVID patients, are going to be flagged as "been in contact" with a positive case. Obviously you do not want to send all these docs home for two weeks.

Vishal: Extremely easy to set up; literally took less than one minute. I'm happy with the government's reassurances that the app data can't, for example, be used by police, courts etc. I think this is the best way we can all work together to contain future outbreaks. My greater concern is why some people feel their "privacy" is more valuable than someone else's life.

Jennie: Downloaded and registered to my iPhone with no problems. I already use Bluetooth for hearing aid streaming and Apple TV etc so the impact of bluetooth on battery life is a minimal concern.

Anonymous: This was stupid. I’m not going to have it open when I’m out and about. It needs to run in the background.

Anthony: Works straight out of the app store. Just got to be sure you’re getting the right app!

Sheryl: The app didn't accept your phone number before 6pm then all systems go. Very quick to install. I joined as I want to live and know if I have been in contact with someone with COVID-19. I have been working very long days ar Centrelink for six weeks now with much more to be done helping Australians so want to remain fit and healthy.

Anonymous: No. This government demands trust without doing anything to earn it. Stuart Robert is totally untrustworthy on a personal and political level. The app is not fully open so what are they hiding? “If you have nothing to hide you have nothing to worry about”. Where have we heard that before?

Jack: Yes, it a great initiative, its the last piece of a good outcome for our country.

Anonymous: No. I won't be trusting it prior to further assurances (and I kind of hope others don't either - so there is a reason to give those further assurances - many are too trusting in my opinion). I don't trust government in the future (data can live for a long time) or their ability to keep the systems secure. And 15 minutes and 1.5 metres as parameters don't make sense. I read The Age articles with interest - the coverage is good - and will continue to follow the story as it develops. I hope to hear more about legislation. I wish I could trust government more but, in part, I can't because so many others do to much and so don't do sufficient due diligence - the widespread acceptance of opt-out rather than opt-in in contracts has made those who want to opt-out t- retain some privacy have to constantly be working just to keep it.

Anonymous: I can't find it on the Google Play store, very frustrating. As a health care professional who comes in to contact with well over a 100 patients a week I was really looking forward to this app being released!

Danny Koreny: Easy to register. But, I want to see the source code released. Friends and family are asking me if it's safe. It'd be good to have it peer reviewed by nerds and engineers such as myself. It'd be a free (external) peer review! Security by obscurity is bad practice. Plus I could put an end to tinfoil hatters and their whacky ideas before they start.