Can I add a non-E.164 number to a phone field for an External Contact?

To add non-E.164 numbers, or numbers that do not conform to the international telephone numbering plan, do the following:

  1. From the country flag list, click No country code .
  2. Enter any combination of letters and numbers.
    Note: SMS does not currently support non-E.164 format phone numbers.

Shows support non-E.164 numbers