What happens with the ticket if I lose my phone or change phones?
You can retrieve your period ticket if you lose your phone if you have registered it in the app. To retrieve your ticket, you must have been logged in to the app on the phone you lost. Transfer the ticket to your new phone by logging in to the app on it.
There is a limit to the number of times you can transfer tickets to a new phone in any 30-day period.
You cannot block tickets yourself, but customer service can help you to block your account on the phone if it has been stolen, for example.