So I am testing out a new carrier, which means I have a temporary phone number in my 6S. I still have the 6 with the ATT SIM. In the new phone, in iMessage settings, "start new convos from" lists both numbers and my apple ID email. I have checked my 'real' number as where new convos should start from. All options are checked in the "you can be reached at" area. yet, no matter what I do, i can't start a convo from my real number. If I check my real number, messages go out from my email address. If I select my temp number, it goes out from there. Am I trying to do something that's impossible? I have a Mac also, from which i AM able to start a new convo from my real number. Thanks for any tips!