Nokia Bootloader Unlock Tool
Dedicated unlock methods:
Nokia 6.1, Nokia 6.1 Plus, Nokia 7, Nokia 7.1,
Nokia 7 Plus, Nokia 8, Nokia 8 Sirocco [Free]
Nokia 6.2 and Nokia 7.2, go here [Free]
Nokia 8.1 and Nokia 9 PureView, go here. [Paid]
Nokia 8.3 users can follow this xda guide [Free]
Dedicated unlock methods:
Nokia 6.1, Nokia 6.1 Plus, Nokia 7, Nokia 7.1,
Nokia 7 Plus, Nokia 8, Nokia 8 Sirocco [Free]
Nokia 6.2 and Nokia 7.2, go here [Free]
Nokia 8.1 and Nokia 9 PureView, go here. [Paid]
Nokia 8.3 users can follow this xda guide [Free]