READI Collect is a web site, so there is nothing to download from an app store. You can still add it to your home screen, where it opens full-screen and one tap away. This takes about a minute and is worth doing before you need it rather than at the roadside.
Steps 1 and 2
Sign in on your phone and READI Collect offers to install itself. There is nothing to buy and nothing to download.
Sign in on your phone → Install → Share → Add to Home Screen
Signed in on a phone, a bar appears along the bottom offering to install. The i beside it explains what installing does; Install starts it; the cross puts the bar away for a month. It never appears once the app is already on your home screen.
On an iPhone, use Safari's Share button, choose Add to Home Screen, then tap Add. On Android the browser offers a real install button and does it for you. Either way you end up with a READI Collect icon that opens full-screen, without the browser bars.
Step 3
For a collector it is what lets new requests arrive as notifications. For everyone else, the honest answer is that it changes less than people expect.
Settings → Notifications
New collection requests can arrive as notifications, the way a text would. Open Settings, Notifications and switch on Push notifications on this device, then allow it when your phone asks. The installed app also offers to turn them on for you. On an iPhone this only works from the copy on your home screen, because Safari allows notifications only for installed web apps. Managers and team members keep getting emails and texts, and everything also lands in your notification inbox.
It is on your home screen. If you are a collector, Topic 9 is the job itself; if you are on a company roster, Topic 7 covers requesting a collection for yourself.