How to get the callerid

Hello All happy new year.

I have a problem in that the callerid I see on my mobile is not the one I want.

I have a BT pstn line with number 1xxxxx which transfers calls to my freepbx system DID, 2xxxxx. I then have FollowMe transfer the call to my mobile phone 3xxxxx. The number I’m seeing on my mobile phone is 2xxxxx. I want to be able to see who is calling so I want the number 1xxxxx on my mobile.

Any help in sorting this problem out would be most welcome.