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1.Different countries have different codes. A number in US has +1, one in Azerbaijan has +994, one in China has +86, one in New Zeeland has +64, etc. You don’t need to manually imput the code unless you make an international code tho.
2.Countries have different lenghts for their numbers.
For example, Romanian phone numbers look like 0XXX XXX XXX (+40 XXX XXX XXX outside the country), so this leaves 1 Bilion possible mumbers to a population of abt 20 million, or 50 phone numbers per person. Indeed there are phone numbers related to companies, agencies, instutions, etc. but even witht his counted, even if this would double the ammount of required telephone numbers, it still leaves abt 25 phone numbers per person.
From what I could find on wikipedia, huge countries like China has a format like this 1XX-XXXX-XXXX which means they have almost 10 bilion possible numbers. (Indeed it’s not always that simple, but you get the idea)
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