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Notify uses the https://pypi.org/project/phonenumbers/ library to
validate phone numbers. There's some scenarios where our regex permits a
phone number that libphonenumber doesn't allow, causing notify to return
an error when sending to that number.
We've gone for rescuing this api error and adding a validation error to
the the form. We may at some point, especially if we move message sending
into a background job, want to investigate using a gem like
https://github.com/daddyz/phonelib that will provide stricter phone
number validations.