How to get my iPhone unlocked

If it is Passcode Lock, check this link...

If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

If it is Activation Lock, check this link...

How to remove Activation Lock - Apple Support

If it is Carrier Lock, check this link...

How to remove Activation Lock - Apple Support

Carrier lock? Call your carrier and ask them to remove the sim lock.

They ar not required to, however.