After the 0 trunk code or +44 country code there may be 9 or 10 digits.
9 digit numbers appear in only 41 of the UK 650 area codes, as well as in all 0500 numbers and some 0800 numbers.
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8 digits
11 digits.
There are 9 digits in a Social Security Number.
200,000,000 9 digits.
There are 4 digits in the number 6709.