How can I unlock my iPhone 7 Plus?

activation lock?

Turn off Activation Lock - Apple Support

carrier lock?

How to unlock your iPhone for use with a different carrier - Apple Support

iPhone disabled?

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

Are you talking about a Carrier Unlock so that your iPhone can be used with other carriers? If YES then you will need to contact the carrier that the iPhone is locked to and ask them about their requirements to get your iPhone unlocked.

If this is not the type of unlock that you are talking about then please provide more details so that we can try and provide the right solution. Thanks.

Axel F.

Review Chris0107's response above which is more detailed than mine. Thanks.

Axel F.