TW · TWN

Taiwan phone number format

Full synthetic number for UI, QA, and parser tests. It is deliberately invalid and cannot be used for real communication.

Calling code

Invalid test number

+886 185 296 307 418

For UI and QA tests only: cannot be used for communication or pass phone-number validity checks.

Example international grouping+886 XXX XXX XXX

This masked mobile example shows one possible grouping. Other number types and prefixes may differ; the invalid test number above is separate QA data.

Possible lengths (digits): 7, 8, 9, 10, 11. Possible national-number lengths across number types in the bundled phone metadata. The invalid test number exceeds the longest listed length.

Use the Taiwan test format safely

The +886 prefix is Taiwan's international calling code. The mask is a display aid, not a rule that decides whether a mobile or fixed-line number exists. If a form has separate calling-code and national-number fields, keep those parts separate in your test cases.

The generated national part has 12 digits, one more than the longest length in the bundled phone metadata. Use it to test layout, copy and invalid-input states. It is intentionally unsuitable for calling or SMS.

Data provenance

Sources

Data snapshot: 2026-09-21