Having quite a lot of trouble with the syncing of iMessage. I have people who had 1 phone number and have a thread with all our correspondance, but then if they get a new phone the messages go into a separate message thread. Is there any way to combine them into 1 single one? Secondly, my iPhone, iPad and Mac iMessages are not in sync with each other, my iPhone has everything, my iPad has very limited messages and none are on my Mac; is there a simple solution? Thanks!