Expected Behavior

I would like to propose to give a change to developers to display a configured message in the settings, in case a Twilio exception happens. Like for example "Unable to create record: The 'To' number +4900000000000 is not a valid phone number.".

It may ocurre if a phone number is incorrectly setup.

Current Behavior

An exception is raise by the Twilio Client, meaning we get an internal error response.

Possible Solution

In case a settings variable like for instance:

TWILIO_ERROR_MESSAGE = 'Some error message'

We display the message using Django's message framework. Otherwise we keep the current behavior.

Steps to Reproduce (for bugs)

1. Enable two factor for a user by configuring a false number for a user Ex: +4900000000000
2. Try to login with the user's username and password.
3. You should get an Internal Error response.

Context

I would like to show users a custom error message, instead of just a 500 or internal error page.

I would gladly make a pull request for this issue.