CID is not showing correctly on follow me setting

The caller called my pbx and the call directed to one extension, Nobody pickup at the extension, then the follow me executed. In the follow me form, I put an cell phone number there. The cell phone rings but does not show the caller’s CID. Instead showing my pbx trunk DID. I did not put the DID number on the trunk setup form for the outbound caller id. But it still shows up. Anyone has any idea what should I do to get follow me to show the correct caller’s ID, not my pbx CID.