Telephone numbers in Spain - Wikipedia
https://en.wikipedia.org/wiki/Telephone_numbers_in_Spain
WEBHistory. Before 1998, local telephone calls could be made using only the subscriber's number without the area code, while the trunk code '9' was omitted when calling from outside Spain, e.g.: [1] xx[x] xx xx (within the same province) . 9xx xxx xxx (within Spain) . +34 xx xxx xxx (outside Spain)
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