I've got nothing to download it on to....

Not even going to try on my phone There was a time when I would pay to keep up with technology but now I don't need all these new features so why pay for them

Not even going to try on my phone There was a time when I would pay to keep up with technology but now I don't need all these new features so why pay for them

I don't have a smartphone, it's not the cost, it's just I don't need one, I don't make phone calls, I'm not enthusiastic enough to want to carry one so I can check the latest tweets or what-have-you on the move. I like tech and have a good understanding of how it all works but in my old age I prefer to leave it all at home. Camera's all I need.

As of Thursday evening, it had been downloaded more than one million times by Android users, according to the Google Play Store.

The total figure is likely to be higher when iPhone downloads are included, but Apple does not provide similar figures for app downloads.

At work I put my phone in a locker - I don't want to be told to isolate just because the guy with the locker next door has a positive test

If you're in this situation, there's a switch on the app to turn it off*. Of course there are always times where it won't work perfectly.

If you leave your phone in your jacket and someone else sits next to it, that might trigger the app. This is technology, not magic - but as most of us are pretty attached to our phones it should be okay.

People who test negative for Covid-19 are unable to share the result with the new NHS app for England and Wales if they did not book the test through the app in the first place.

The app asks for a code to register a test result but a code is only received if the test is positive. Those who enter that they have symptoms without entering a result find a self-isolation countdown begins.

The Department for Health and Social Care said the app would be updated.

Rory Cellan-Jones & Zoe Kleinman

The app itself may look simple, but it has thrown up lots of questions about how it works and what its limits are.

Here's our attempt to answer some of your queries:

A number of people have reported getting notifications about exposure to the virus and then not being able to find out what they need to do next.

Some are confused because of the way they are written - including the phrase "exposure date, duration and signal strength have been saved".

It appears that this again may be connected to the Apple-Google system, which sometimes sends out what are called exposure notifications. Here's what the FAQ from the app team says about this issue:

"These are default messages from Apple and Google. There is no need to be concerned if you miss or overlook them, they are just visible to remind you that the functionality is on and working. You're currently not able to turn off these default Apple and Google notifications.Important messages from the NHS Covid-19 app will always be visible to you from inside the app."

The NHS Covid-19 app for England and Wales has more than 16,000,000 downloads so far - but a range of employers are actively discouraging their staff from using it.

Earlier this week, both the pharmaceuticals company GlaxoSmithKline and a Hull-based fuel supplier told staff the app should be switched off at work - both said it was unnecessary in their "Covid-secure" workplaces.

And now, there are numerous reports teachers are being told they should not use the app in school.

A teacher in north-west England, who wants to remain anonymous, downloaded the app on the day it was released and then, last Monday, tested positive for coronavirus. It then triggered alerts telling three colleagues at the school to go into isolation.

But, according to the teacher, the secondary school's business manager told the three people involved to ignore the messages and delete the app if they felt they had not been within 2m (6ft) for at least 15 minutes.

"Too many schools want to keep staff in, even if it means breaking the law," the anonymous teacher said.

The NHS Covid-19 app has been updated to fix an issue with confusing alerts that pop up suggesting exposure to the virus and then disappear. The alerts will still appear, but now a follow-up message from the government will tell people to ignore them.

The team behind the app, which has been downloaded more than 16 million times, is working on a more substantial update which will involve moving to version two of the Apple-Google framework.

This could stop the confusing notifications appearing altogether but will also improve the way the app uses Bluetooth to measure distance between two phones.