Thanks for this!
Can I ask how would it be with 2 variables, one of them being a date used as a timestamp hence going at the same place as the “true” in the example above?
I support the need for international phone number and we too would love to have that. Yet, I believe there are better solutions than the one proposed above.
What not to do
1/ The format must not be defined at the field level, otherwise, in a contact ...