FA-96540 / Phone number formatting / Member archive

National number type validator: fixed lines may start with 0 or 1 · case 05

"1..." is accepted as a fixed line.

Member previewVariant 5 · 3 implementations · 14 checks per implementation

Case contract

Input [national significant number, country]; non-digit input is invalid. AA: prefix 600 is toll-free with 9 digits; leading 7 is mobile with 9 digits; leading 2..6 is fixed with 8 or 9 digits. BB: exactly 10 digits, leading 9 mobile, leading 3..8 fixed. CC: 7 digits with a leading 2..9 is "fixed_or_mobile". Everything else is "invalid".

Why this case matters

Number type decides SMS eligibility, pricing and fraud rules; the checks overlap on leading digits, so order and bounds matter.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixed line cannot start 1	`"fixed"`	`"invalid"`	Failed

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