I have to iPhones: a work one and a personal one. The work one was the first to get wifi calling and now my personal has wifi calling. When I try to upgrade to wifi calling on my iPad, it only recognizes my work phone the same thing happens to my rMBP. How to do I change to my personal phone? I signed out of iCloud on my work phone but the iPad and rMBP only want to do it with my work number.