I have an iPhone iCloud locked. Can I unlock it?

I have an iPhone iCloud locked. Can I unlock it? - 1

Yes. Enter your Apple ID and password. If the phone is genuinely yours then that fixes it.

But if you have a stolen phone then you have a phone which is useless to anyone but the owner who may be tracking its location and may be getting sent covertly taken images of you and your surroundings.

Activation Lock ensures that there's almost no profit in taking the risk of stealing an iPhone.

If you found the phone and failed to hand it in then you've become a thief; "finders keepers" has no legal basis in any civilised country.

Yes if you know the password. Otherwise let me know if that makes a good paperweight.