can i provide you with my iphone 11 serial number and have my iphone unlocked

No. We can't, and neither can Apple with nothing but the serial number.

If you would like to tell us how it is "locked", we can help guide you in how to unlock it...

Is it carrier locked? Locked with a passcode you can't remember? Activation locked?

Good afternoon,

Apple provides a service for those with a second-hand and Activation Locked device. To start this process, follow the following link: https://al-support.apple.com/#/additional-support. Before you get started, you should know that Apple reserves the right to refuse or cancel any request for Activation Lock support.

Have a great weekend, and thanks for reaching out to the Apple Support Community.

SIM locked to a carrier: Contact the carrier it is locked to and ask about their unlocking policy—>How to unlock your iPhone for use with a different carrier - Apple Support

Apple does not provide services to remove Activation Lock on used devices. Only for the original owner with the original receipt.