I just set up my iPhone 6 last night, but I left my 5s (still iOS7) turned on, on wifi. Everything is working great with the 6, but at some point there was a pop-up on the 5s saying it was configured for iMessage with my email. All my iMessages and texts seem to be coming properly to my 6, but this pop-up on the 5s was mysterious, probably bc this is the firdt time I've had two iMessage-capable devices at once. Can anyone explain? Will iMessages come to my 6 always unless I specifically send one from my 5s on wifi and someone replies? Thanks