when someone sends me a long message on my iphone I do not receive the whole message

When someone sends me a long message on my iphone se I can no long see the whole messsage. Before the last 2 updates I was able to see any message sent to me no matter how long or short. If it was to big to fit the screen there was an arrow or some thing that alerted me that the message was continued. I am not alerted since the last 2 os updates the message is just cut off. How do I fix it?