Hi James, I had this problem with just one contact for about two years. When I received texts from her, I noticed that they showed up with a comma in front of the number. Hence, the number that I was trying to reply to was not valid. I had to manually type her # in every time. I edited the contact dozens of times from both my phone & Outlook, and even tried deleting & recreating it. I got a new phone today, and this one shows me more details than the old one. I was able to see that I had her mobile # set up twice. One number had a plus in front of it. As soon as I deleted the # with the extra plus, my problem went away. I think the issue was that I had her set up as a contact in multiple locations: Outlook & one of my two Gmail accounts. When it tried to merge the two, it kept them as two different numbers because the number formats were different. I'm guessing I didn't delete all of the occurrences of that contact when I deleted (probably just one, or one at a time), so when I recreated it & it tried to match them up again, the issue came back. Hope this helps!