I have noticed that whenever I send message to somebody then some of the times it goes as iMessage (light blue) and/or as a Text Message (normal green as IOS 4). I am not able to make out that what is the difference between that. I would really appreciate if someone of you can provide me some information on this that what is the difference between these. There is no problem to the delivery of the message but I w ant to know that what is the difference between these.
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