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Yes! Carriers who assign numbers to SIMs in advance could set that field directly. Others, either because they don't assign a number at the time of the SIM man
by Nextgrid 5y ago
Yes!
Carriers who assign numbers to SIMs in advance could set that field directly. Others, either because they don't assign a number at the time of the SIM manufacture/personalization or just because they can't be bothered as it's not functionally necessary will leave it blank - in that case from my experience iPhones will populate the field with the number they get back from the iMessage & FaceTime provisioning step but again that's not actually necessary for functionality. The field is also user-editable in Settings -> Phone if you wish.