how to add phone number to messages ios
I have a 6+ and want to add a second phone number to messages, how?
iPhone 6 Plus, iOS 8.1.3
On the other iPhone that uses the other number, enable iMessage. On both iPhones, sign into your Apple ID for iMessage (Settings > Messages > Send & Receive).
This should link both phone numbers to your Apple ID, and then any iMessage sent to either number or your Apple ID should appear on both devices.