How to i set icon of the phone field type universally in CRM

SuiteCRM-8 How to i set icon or modified the behavior of the field type universally,
Like I have phone field I want to change the view formate of the phone field or I want to set the icon beside the phone field, how do i achieve it.

I tried to make changes in :- suite8/public/legacy/custom/include/SugarFields/Fields/Phone/DetailView.tpl

but it’s not working with the CRM default module but when i create the new module its workers.

Please suggest me the solutions for the same