iMessage not receiving as normal text after leaving Wi-Fi
When I start a conversation with someone in a Wi-Fi zone, with iMessage turned on, it send in a blue bubble. When I leave the wifi zone and keep the conversation going its turns green, the problem is that once I leave the wifi zone in a iMessage started convorsation I wont receive texts until I re-enter a wifi zone. How can I change this? Turning off iMessage doesn't seem to help because I will receive some messages but not all. until I get in a WiFi zone.
Note: I don't have a data plan, just unlimited text messaging.
iPhone 4, iOS 6.1.3