How to send SMS rather then iMessage on iOS 5
Is there any way how to send SMS instead of iMessage? I wont to use iMessage a lot because lot of my friends have iPhone. However, my wife has iPhone too but without data plan. When she is at home or at work, whe's connected via Wi-Fi and she can receive iMessage. But when she is shopping and has no wi-fi, I need to send SMS. At that time, my iPhone is still remembering that I can send the iMessage. How can I choose that I want to sent SMS (just one SMS)?
P.S.: Please, don't tell me to post this to Dev forum. I tried but I cannot login to the forum. I'm logged in to Apple dev pages, but when I clic on "Forum" it doesn't work (don't know why)...
iPhone 4, iOS 4.3.4