Sign in at 1kr.uk and open Phones. Phones signed in to your account. Removing one signs it out; what's stored on the phone stays there. For each phone you see the app, its version, when it was linked and last seen, its status, and whether Google Play verified it.
Adding a phone:
- 1krBlocker: Create a code, then in the app open Settings → Account → Link this phone and type it. The code works once, for 10 minutes.
- 1krNote: 1krNote phones sign in with your e-mail and password in the app. A plan covers 1 phone (Max: 3); signing in on a new phone can replace the one used least recently.
Limits: each plan covers a number of phones per app at the same time: Family and Max cover 3, 1krBlocker's free plan 3 linked phones, the others 1. 1krBlocker phones beyond the limit keep working with the free features. Only phones in use count: a phone you remove stops counting at once, and one that isn't used stops counting after 30 days.
Removing a phone: tap Remove next to it. It's signed out of your account; protection and notes on the phone keep working without the plan's features. You can also remove a 1krBlocker phone in the app: Settings → Account → Remove this phone.
Check this page now and then: remove phones you don't recognise, and change your password if you find one.