Evrotrust

For Android - you have to go to PlayStore - Payments and Subscriptions - Subscriptions and deactivate it from there. For iOS - Settings - Profile/Apple ID - Subscriptions.

1. Registration shall be accepted only with an Identity Document, an Identity Card for citizenship or an International Passport. Personal ID number for a foreigner, blue cards, driver's licenses, etc. are not accepted by law. Foreigners can register with their national documents according to the list of supported countries https://www.evrotrust.com/doc/eIDAS/Countries_en.html. [...]

Yes, you can use your QES for other or personal purposes. QES is personal and you can sign any documents such as: Bank account opening Submission of tax return in NRA Applications for an unemployed at the NEA, Commercial Register etc. Issuance of a criminal record certificate Powers of attorney, [...]

The registration, the issuing the QES and the signing of all documents for the purposes of an Electronic Labour File is absolutely free for the employees.

No, you cannot use a signature from another provider.