Cracked Screen And I Can't Enter Pin Code - Remote PIN Change??

Hi Guys, today I managed to drop my phone, cracking my screen, and this now means I cannot type in my PIN number to access my phone. Also means I cannot back up all my info before sending the phone for repair/replacement.

I read it is possible to bypass/change the screenlock PIN, however I've not worked out how.

Can anyone assist on this???

Thank you.