4s seems to have issue switching FROM iMessaging to SMS
I use my iPhone 4s a lot text while connected to wifi and sending to other iPhones. But it seems that when I go outside of the wifi zone and try to send, it seems to take FOREVER to send, sometimes not sending at all, even though I'm showing at least 3 bars and 3G. What's the deal? Is there some sort of problem with the software switching back and forth?
iPhone 4, iOS 5