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Actually they have 11 digits - At least they do in the UK ! It's just the form agreed by the mobile phone companies. For example 07xxx defines the network the phone is locked to and the remaining six digits identify the individual phone.
10 digits are numbers in the billions.
Some of them are: 11 13 17 37 and 79
Still 11
I don't, I get lots from numbers with 11 digits.