I synced my old Xperia with a newer Xperia X. All worked fine except in my text message conversations, husband shows up as two numbers rather than contact name ie '07xxxxxxxxx;07xxxxxxxxx'. The first number is an old number he only had for a few days while his ported, the second is his current number, I must have added it to his contact at the time then deleted it later. Only his current number appears anywhere in his contacts.
This now means that in that conversation, there's no 'reply' option. I can text him by starting a new message and as long as I keep messenger open, the conversation is listed under his contact name. However, if I close and then reopen the messenger our conversation appears under the double-number rather than his name again, without a reply option. I need to be able to 1) edit the contact data within messenger or 2) delete the messages attached to the old number, if I can even find them.