Apple announced details of their upcoming iOS5 earlier this week. One of the new, more promising features, iMessage, is very similar to BBM in function. As most proprietary features like Facetime and Notifications don't work over the Speakout proxy, I have very little hope that iMessage will either. The problem is that iMessage is transparant and works from the built in Message app. If you contact is detected as an iPhone user, your message is sent via iMessage, if not, the message goes SMS. I can only hope that the app will still be able to send SMS to another iPhone without having to wait for an iMessage delivery to fail first.

SMS works fine with IOS 5. The integrated iMessage does not work unless you have an active Wi-Fi connection. Your phone can be set up to send an SMS if the iMessage send fails.