For some reason, my iphone 5 (ios6) has created 2 text/imessage threads for conversations with my sister's contact on the phone. One thread for messages from me to her. Another one from her to me. My contact details for my sister include both phone number and email address. Yet, even though her email address is added to the same contact as her number on my phone, I keep getting return messages from her with the contact name "[name]@googlemail.com" Even when I re-add it to my one contact for her, it just gets added as a second email address (the first one being the same address!) and still remains in two separate message threads. In her Settings > Messages > Send & Receive - she has "You can be reached by imessage at" [phone number] and . Her phone number is greyed out, and can't be selected, and her email is selected. Any help?