E.164 phone number field characteristics

What an E.164 phone number field displays.

An E.164 phone number field displays:
  • [Optional] A choice list for the phone number territory.
  • [Always] An input box for entering phone numbers.
  • [By Default] A red underline when a phone number does not match the format for the selected phone territory and cannot be saved.
  • [Optional] A green underline when a phone number does not match the format for the selected phone territory but can be saved with Other / Unknown as the territory.
Figure 1. Phone e164