Assuming that there is no error, the probability is 0. Your local number may be the same as someone from another town but your area code will be different so that the telephone number is different. If the area code + local numbers are the same then the country code will be different.
Telecommunication companies and their international umbrella organisation (ITU) ensure that when all the relevant country, area, exchange codes (etc) are included, there are enough numbers for every telephone and related device (fax machines), so that there are no duplicates.
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1 in 6. Basically dice 1 can roll any number So the odds are that dice 2 has the same number as dice 1, or 1 in 6
a fax number is just the same as a phone number so the same number of numbers
The odds of rolling any specific number in one roll of one die is 1 in 6. Each die is unrelated, so the odds of rolling the same specific number using six dice in one roll is 1 in 6 to the 6th, or 1 in 46,656.
The odds are 1 in 2.
There are no odds. It just happens.