On iPhone/iPad, you cannot manually activate keys purchased elsewhere; you must use the Restore purchase feature within the app while logged into the same Apple ID.
Go to the official Navitel website and log into your Personal Account (or create one). Navigate to the section. activate key navitel
: While you can reinstall the app on the same device as many times as needed, moving a license to a device usually requires a Deactivation Request through Navitel Support. Operating System Constraints On iPhone/iPad, you cannot manually activate keys purchased