Unlock account

If you had attempted unlocking multiple times with incorrect Lock Screen passcode, or if a message says that your device is disabled, learn what you need,

You need a computer to follow these steps. If you don't have a computer, borrow one from a friend.

Forgot? Click below to reset…

Click->If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...

Carrier Lock:- Though your iPhone’s original Carrier is not obligatory to unlock your iPhone, but you may know the process here --> How to unlock your iPhone for use with a different carrier ...

If you are the owner of the iPhone or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Learn how to remove a device from a previous owner's account.

If you are not the owner of the iPhone and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password to you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their apple ID.

Assuming that by "locked" you mean you're locked out of your device because you can't remember your main access passcode all you can do is recover your phone on iTunes. That'll take care of your problem by wiping out your phone including any password and passcode. Hopefully your content is backed up.

If you have locked your Apple ID --> If your Apple ID is locked or disabled - Apple Support