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How does iphone add contacts in SMS?

Take the iphone 7 as an example.

operation sequence/order

1. To start, first enter the SMS operation interface, find the "Details" option, and click Open.

2. After entering the detailed information operation interface, find the "circled I" icon option and click Open.

3. After entering the new operation interface, find the "New Contact" option and click Open.

4. Finally, enter the relevant information and click Finish to add it to the contact.