Log in to someone else's apple ID, and you can't receive SMS in the case of double authentication. Will SMS be intercepted by criminals?

This is not true. SMS is sent to your mobile phone by the official platform, which has secure communication guarantee and does not exist the problem of being intercepted by criminals.

Generally, due to network delay, the verification message cannot be received. Check your mobile phone network, go to a place with good network signal, or log in with another device.

Apple ID is the account you use to access all Apple services and make all devices collaborate seamlessly. You can use App Store, iCloud, iMessage information, Apple Music, Apple TV+. After logging in, if you are prompted to enter the verification code, please enter the six-digit verification code that has been sent to your trusted device or phone number, and then complete the login. Keep settings and Apple services up-to-date on all devices. Just log in with the same Apple ID everywhere.

Apple ID also has the function of "family * * *". With "Family * * *" enabled, you can enjoy the content purchased by iTunes Store and App Store, iCloud storage space and other content with your family * * *. Parents can also use "pre-purchase inquiry" to approve their children's purchase requests, and set usage restrictions on their children's devices through "screen usage time".