Unlock my phone remotely, network is off

[AC Question]

Hi everyone,
Trying to unlock my phone, because it doesn't recognise my finger print. I forgot my backup password, so I have been directed to the find my mobile website,to unlock it remotely. But my network is off ( mobile data turned off). I can't switch it on because my screen is locked,how do I switch it on because it won't allow me since my phone is locked,... Frustrated, please help...