If you have reported the device as lost, the device will be locked and there is no way to unlock it. Please contact customer support if you have found the phone after reporting it as lost.
HMD Global Oy UK Branch, of 2 Kingdom Street, Level 2, London, Paddington Central, W2 6BD, registered in England and Wales under Company No FC033770, UK Establishment No BR018857, is authorised and regulated by the Financial Conduct Authority under firm reference No 949221.