iPhone 5 New iCloud address, but still have iMessage from previous iCloud I made a new iCloud address, but when I checked my iMessage, it had messages from my old iCloud. Do I have to manually delete these messages? 
Also, would my content in my iMessage app then be connected to my new iCloud address? Since I have synced the new one to my current phone
I've done it myself. The only way to erase all messages was one by one.

The good part is that only new messages were synced!