A curiosity that I see around the internet about the released iPhones is that when it is plugged into the iMac / PC, the phone number appears in iTunes. Also, if you click on it, it changes to IMEI and ICCID. The really interesting thing is that this does not appear to everyone.
Here You can see how to put it if it does not appear. It looks like it may have to do with the operator. The one in the photo is Movistar.
In addition to appearing in iTunes, our phone number is shown in the Settings / Phone and in All Contacts of our iPhone.