Why does appleid code always receive text messages?

This code is always sent by SMS for the following reasons:

1. Double authentication: This is a security measure provided by Apple. When an individual turns on dual authentication, the mobile phone verification code is required to log in to apple id.

2. Verification code: When registering or retrieving the apple id, you need to receive the verification code by SMS to verify your identity.

3. Phishing SMS: Sometimes, criminals use forged apple id SMS to get their personal information, such as passwords and bank card numbers.