The magic in org-mode appears to happen in org-open-at-point in org.el.
You could try overwriting that with a copy that deals with "tel:".
Asking on the org-mode mailing list would probably give you an informed
answer, compared with this speculation :-)
In return, what's the best current phone for running Emacs and/or
Mobile-Org?
Brendan
--
Brendan Halpin, Department of Sociology, University of Limerick, Ireland
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