i want a unlock my iPhone

Have you forgotten your passcode?, 

(< iOS 15.2) See this Apple article: If you forgot your iPhone passcode

If you forgot your iPhone passcode - Apple Support

(iOS 15.2 and newer) How to reset your iPhone, iPad or iPod touch if you've forgotten your passcode

How to reset your iPhone, iPad or iPod touch if you've forgotten your passcode – Apple Support (UK)

 How to unlock your iPhone for use with a different carrier

https://support.apple.com/en-us/HT201328

You will need to contact your carrier and ask them to unlock it, they are the only ones who can.