How can I be sure that the cover is valid?

To be sure that your cover is valid you should check

the validity dates of the policy to make sure that it has not expired or been renewed;

(in the case of a Rechargeable formula) the remaining credit. When the credit is exhausted, the cover will no longer be valid.

The Tracking Function: i.e. having given consent to geolocalisation and not having deactivated it from the app or phone settings at the time of travel.