[greasyspoon]

I have two devices a 925 and 1020. One has a sim and the other does not, but both got a sms message. Is this iMessage type functionality that I am unaware of where all devices get messages?

[WhiteNiteLite]

This is actually a side effect of the text message backup that's been in place since WP8.0. The device that has the SIM gets the new message and pushes it up to Microsoft's servers to backup. The device without the SIM sees a change in the server backup state and pulls it down. Therefore, it looks like both got the message.

If you really pay attention, you'll notice there's a delay between the time it takes to sync over. And the phone without the SIM won't be able to respond.

[Windowlino]

edit: to late; WhiteNiteLite was faster :)

Are you using the same MS-account for both of them? If yes, maybe it's because of the SMS Backup/Sync Feature?! If you're talking about the MS Welcome SMS: this one is not send via GSM Network I'd guess ;)

[greasyspoon]

Bummer. Was hoping for that functionality. Would have been cool.