Together we are? (It's not what you see that counts)

Question

Try make sense of this little puzzle below. The full answer is twelve letters long but it's usually abbreviated.

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The numbers below are arranged in order

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237       238 
358       689
995       233
972       225
1876      441534
971       1
44        598

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Hint1

Mostly three digit numbers... Why is that?

Answer 1

The answer here is:

GROUP OF SEVEN, usually abbreviated to G7, i.e. the international political forum comprised of Canada, France, Germany, Italy, Japan, the UK, and the USA.

To find this, note first that the listed numbers are all:

valid international dialling codes (i.e. the prefixes you use before the local phone number when calling somebody in another country).

And these relate to:

237 CAMEROON
238 CAPE VERDE

358 FINLAND
689 FRENCH POLYNESIA

995 GEORGIA
233 GHANA

972 ISRAEL
225 IVORY COAST

1876 JAMAICA
441534 JERSEY

971 UNITED ARAB EMIRATES
1 UNITED STATES

44 UNITED KINGDOM
598 URUGUAY

Note next that these pairs:

indicate countries which are very close together alphabetically. Armed with the title hint that it's 'not what you see that counts' let's look at the nations that come in between these countries in a list of international dialling codes.

What you draw out of this process really depends on what you consider as your authoritative information source here, but I can identify the following 'inbetweeners':

CANADA
FRANCE, FRENCH ANTILLES, FRENCH GUIANA
GERMANY
ITALY
JAPAN
UK
UNITED STATES, UNITED STATES VIRGIN ISLANDS

And by now the intended pattern is clear:

If we take only the most major of all the countries listed above, then we produce the group: CANADA, FRANCE, GERMANY, ITALY, JAPAN, UK, and USA. These are clearly recognisable as the group of nations that make up the Group of Seven (I wonder how they came up with that name?!), which should surely be the 12-letter answer intended here!