If I receive a message from someone using iMessage, I will get a notification. If I do not check my phone within 5 minutes, I will receieve another message, although this time it registers a "text" message. So, If I open my phone at least 10 minutes after receiving the latest message, I will have the same message repeating 2 times in a row in the message app, one using iMessage, and one using standard text messagining.
Why does this happen, and is there any way to prevent this, as it's quite annoying to see double posts of the same message, and having my phone go off 4 times while I'm busy for the same message.
This has happened on various occasions with a few of my contacts now.