Messages problem with iMessage and text of the same contact seperating
So when ever i seem to text someone with an iPhone and the message is sent as a text, if the they reply with iMessage i seem to have a separate contact for them on the message app. This has happened on all my contacts who seem to have iPhones too, does anyone know the solution to join both of these messages to the same contact together? as this is getting to be a struggle to keep up with the conversation when i keep having to go back to the different message (of the same contact) but have split due to one being imessage and the other just plain text
iPhone 4