Google Sheet Script or Macro Required

I have a sheet which gets phone numbers from third party.
I want a script which can run even when sheet is not opened.

Script required for
converting number in col D from
+91-324566456
-546945654 45
1 4353 34556
+666456 5664

to

91324566456
546945654 45
1435334556
6664565664

Please let me know if you can provide with the script which can run when ever a new record is created or every one min even when sheet is not open.

Regards