A field contains a malformed phone number.
[1] invalid_phone_number rule reference
| Code | invalid_phone_number |
|---|---|
| Standard | GTFS |
| Source | MobilityData canonical GTFS Schedule validator |
| Severity | ERROR |
| Category | format |
| Maturity | draft |
| Tags | mobilitydata, gtfs, format |
| Retrieved | 2026-06-12 |
| Reference | https://gtfs-validator.mobilitydata.org/rules.html#invalid_phone_number-rule |
