Replying to myself: the missing ‘country code’ issue seems to be a red herring. Apple seems to be the real culprit in our case. If one iPhone is connected to the internet iMessages becomes the text vehicle and its output will only be received by a...
My wife’s iPhone (Public Mobile) could send my iPhone (Fido) text messages but hers would not receive my replies unless the phone was connected to the interweb, when presumably ‘iMessage’ took over. I found that her setting for Messages had the numb...
