Phone access
Make a personal, one-time sign-in link to get the mobile app onto your phone, where the QR code isn't available.
"Phone access" is a card under Settings → Account and device (headed Get it on your phone in the new Settings layout) for getting signed in on your phone. Most accounts get "Get it on your phone" there instead, with a QR code you scan: see Get it on your phone.
Making a link
Tap "Make a phone sign-in link" and EverySqueeze mints "Your phone sign-in link" — a personal credential. Text or AirDrop it to your phone, then open it there. This link works once, on the device where you open it; need another later — a new phone, one you lost — make a fresh one any time from this same card. The link, and the phone it signs in, last only while the session that made it stays signed in. A phone at the end of a long chain of phones added this way can't make another link: make it from your computer.
The QR option
Where it's turned on, a QR code you scan with your phone's camera replaces this card, with nothing to type or send. See Get it on your phone. Assistants don't get either one: they sign in on their phone with their own login.
After opening the link
On iPhone, open it in Safari, then Share → Add to Home Screen. On Android, open it in Chrome, then menu → Add to Home screen. See Installing the mobile app for the full steps.
Too many links today?
There's a daily limit on how many sign-in links you can mint. If you hit it, use a link you already made rather than requesting another right away.
The setup walkthrough also mints one of these automatically once you finish, so you often won't need to come here at all for your first phone.