Add smsish to your INSTALLED_APPS and set SMS_BACKEND.
INSTALLED_APPS += (
'smsish',
)
SMS_BACKEND_CONSOLE = 'smsish.sms.backends.console.SMSBackend'
SMS_BACKEND_DUMMY = 'smsish.sms.backends.dummy.SMSBackend'
SMS_BACKEND_TWILIO = 'smsish.sms.backends.twilio.SMSBackend'
SMS_BACKEND = SMS_BACKEND_DUMMY
To use the Twilio backend set some additional settings as well.
TWILIO_ACCOUNT_SID = os.getenv("TWILIO_ACCOUNT_SID", None)
TWILIO_AUTH_TOKEN = os.getenv("TWILIO_AUTH_TOKEN", None)
TWILIO_MAGIC_FROM_NUMBER = "+15005550006" # This number passes all validation.
TWILIO_FROM_NUMBER = os.getenv("TWILIO_FROM_NUMBER", TWILIO_MAGIC_FROM_NUMBER)
Note: You must also pip install twilio to use the Twilio backend.