my iphone 11 sim locked how to unlock with Ethiopia carr

Only the carrier that locked the SIM has the key to unlock it. Contact the mobile carrier’s support team to unlock it. This is not an Apple issue.

Click on the link to read Apple's support article on how to unlock your iPhone for use with a different carrier. - How to unlock your iPhone for use with a different carrier - Apple Support - Only some carriers offer the ability to unlock iPhone for use on any carrier. Follow the instructions in this article to unlock your iPhone.

Only the carrier the device is locked to can unlock it for use on other carriers. You will have to contact them to request an unlock.

Note that if you are not a current or former customer in good standing of the carrier it is locked to, it is unlikely they will agree to unlock it.