You can display your phone number from iPhone Settings.
1.Select Settings and then Phone.
2.Select My Number.
3.Your phone number should be displayed on screen.
You can also check the number from Contacts.
1.Tap Contacts on your iPhone Home screen.
2.Drag down from the top of the Contacts window
3.Your phone number should be displayed on screen.
Now all you have to do is memorize the number before someone asks for it.
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