Phone Number Validation

Can I validate the phone number format for different country by using the country code picker?

Start by reviewing the library's existing international phone validation support and the libphonenumber-related functionality described in the repository metadata. The issue does not identify files, tests, or a precise expected behavior, so the desired country-specific validation and completion criteria need clarification before implementation.

索引モデルが issue の本文から書いたものです。