cannot lock or unlock iphone imei ****

Hi,

A password is required to activate this device because its owner has used Find My iPhone to link it to their Apple ID.

If this is your device, enter the Apple ID and password you used to set up iCloud.

If you were given this device or purchased it second-hand, you will need to contact the original owner to have them remove the device from their account.

Find My iPhone Activation Lock - Apple Support

Unlocking SIM can only be done by the carrier that locked the iPhone.

You have to call them and ask, and if you qualify.