I am using the Android Messages app to send an SMS to more than one person at a time. I get prompted with a message that "Messages needs your phone number" and a button labelled "Fix". I then get this dialog:
I have two questions:
Why does Android Messages need my phone number? Doesn't it know it already? Will I have to change it later if I change SIM card? I don't get this prompt when sending an SMS message to one person.
Is Android Messages doing something other than sending normal SMS messages here?
I'm using Android 6 and the latest version of Android Messages from the Play store.