How can I unlock my phone? I forgot my pincode

Hello,

It appears you may have a disabled mobile device or forgotten device passcode. Refer to this support article for various methods that you can use to resolve this. Which one you can use depends upon your equipment configuration. --> If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

Your only option is to reset the device - completely erasing it - and then restoring from a prior backup.