global

def sms_setup(phone_number) 

def sms_setup(phone_number)
  # Cannot handle uniqueness violation here, as the phone number given may not match the
  # one in the table.
  sms_ds.insert(sms_id_column=>session_value, sms_phone_column=>phone_number)
  remove_instance_variable(:@sms) if instance_variable_defined?(:@sms)
end