New iPhone purchased from Apple shows "No Service"
I purchased a new iPhone directly from Apple. The purchase process included my phone number and AT&T as the provider. When the phone arrived I went through the setup process correctly - transferred all Contacts, photos, etc. just fine. But when I restart the phone it displays "Searching..." for a few seconds then "No Service". My wife's iPhone is working fine. When I log into myATT and look at my devices it shows my phone number is still tied to my old Samsung phone. What do I need to do to get that changed? Thanks!