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class RegisterController extends BaseController {  
  Future<void> registerOrLogin(String phone) async {
    Map<String, String> userAttributes = {'phone_number': phone, 'email': "ignored@ignored.com"};
    try {
      SignUpResult result = await Amplify.Auth.signUp(
          username: phone,
          password: "ThisIsIgnored!",
          options: CognitoSignUpOptions(userAttributes: userAttributes));
      Fimber.d("isSignUpComplete: ${result.isSignUpComplete}");
    } on UsernameExistsException catch (_) {

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functions:
....
  #### COGNITO TRIGGERS
  cognitoCreateAuthChallange:
    handler: src/handlers/auth.create_auth_challange
    events:
      - cognitoUserPool:
          pool: ${self:provider.environment.COGNITO_USER_POOL_NAME}
          existing: true
          trigger: CreateAuthChallenge

Bersh

def define_auth_challange(event, context):
    logger.info('define_auth_challange incoming event: ', event)
    session_len = len(event['request']['session'])
    last_session_index = session_len - 1
    # The first auth request for CUSTOM_CHALLENGE from the AWSMobileClient (in iOS native app) actually comes in as an "SRP_A" challenge (BUG in AWS iOS SDK), so switch to CUSTOM_CHALLENGE and clear session.
    if event['request']['session'] and session_len > 0 and event['request']['session'][last_session_index]['challengeName'] == "SRP_A":
        event['request']['session'] = []
        event['response']['issueTokens'] = False
        event['response']['failAuthentication'] = False
        event['response']['challengeName'] = 'CUSTOM_CHALLENGE'

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def verify_auth_challenge(event, context):
    logger.info('RECEIVED Event: ', event)

    expectedAnswer = event['request']['privateChallengeParameters']['passCode']

    if event['request']['challengeAnswer'] == expectedAnswer:
        event['response']['answerCorrect'] = True
    else:
        event['response']['answerCorrect'] = False

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def create_auth_challange(event, context):
    logger.info('create_auth_challange incoming event: ', event)
    phone = event['request']['userAttributes']['phone_number']
    if phone == "+000000000000":
        pass_code = "111111"
    else:
        pass_code = ''.join(["{}".format(randint(0, 9))
                             for num in range(0, 6)])
        send_sms_with_external_provider(pass_Code) # This you replace with your own send sms API call

Bersh

def pre_signup(event, context):
    logger.info('RECEIVED Event: ', event)

    event['response']['autoConfirmUser'] = True
    event['response']['autoVerifyPhone'] = True

    return event