How does iphone add contacts?

Adding contacts via iphone SMS is usually divided into four steps:

Step 1: Open the SMS and click "Details".

Step 2: Open the details and click the circled I next to the phone.

Step 3, open the details of the SMS sender, including adding existing contacts and creating new contacts.

Step 4: Select a new contact here, as shown below, and finally click Finish to add it to the address book.

Touch ID

Touch ID is Apple's fingerprint identification technology. It first appeared on the iPhone 5s. Touch id; It is also used in the following models: iPhone SE, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus and iPhone SE. Cancel this feature from subsequent models of iPhone X.