Change the placeholder to a country code that no other country uses.

[youssefelzedy]

Description, Motivation & Context

After a misunderstanding about the +31 code, which represents a phone number for the country of Holden, @tyrasd suggested changing this code to any other code that doesn't belong to any country. He then suggested the code +876. After searching Wikipedia, it turned out to be for the country of North America.

After some thought, he realized that after choosing a random number, it's possible that one day another country will come and take it, and in that case, we wouldn't have done anything about it. So, he suggested changing this from a number to a symbol like +XX, so that it doesn't represent any country. Thus, we would have solved the problem once and for all, and we wouldn't need to change it again.

Related issues

#10917

Links and data

https://en.wikipedia.org/wiki/Area_codes_876_and_658

[Vectorial1024]

Alternatively, some sort of zero-value might just work. Like, "+000 0000 0000 0000". Then, it communicates there should be some sort of country phone prefix, followed by the local format of the phone number.

I was not there when the previous PR was drafted, but indeed, the problem was somehow selecting specifically +31 (the Netherlands) instead of admitting "the schema/system doesn't know". Let's see how others feel about whether "XX" or "00" should be used.

[youssefelzedy]

@Vectorial1024 It is a perfect idea to use +00. I found that there is no country using +00 as a country code.
What about you @tyrasd ?

Here is the list of all the code countries:
https://en.wikipedia.org/wiki/List_of_telephone_country_codes

[Vectorial1024]

Whether using 0 or X, 3 digit is recommended because some phone prefixes are 3 digits (eg Hong Kong +852).

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[tordans]

Lets go with @Vectorial1024's suggestion and merge this as +000 0000 0000 0000