Dear Tom,
There is no way to send caller id of original caller to the cell through call forwarding , this is because when we enabled call forwarding on the station then PBX actually receive the call and then Transfer the call to the cell through separate line/Channel that is why number of your own Line will be displayed on the cell.
Suppose Party A Call B, Now B Receive Calls and Transfer to C.
Connection established between A->C but through two separate lines
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