How come this doesn't show up?

Okay so I have an iPod touch 4g and since there's iMessage on there you can text other people on iPods, iPads, iMacs, and iPhones but when you text someone on a iPhone it doesn't show that they have read the message even when they reply… How come it doesn't show? And it's only on iPhones that it doesn't show. So yeah please help me?

The person with the iPhone could have there 'read' message turned off. I have an iPhone 4 and I have the choice of whether to let the other person know I have read the message or not. Maybe ask your friends whether they have it turned off or not? Otherwise I'm not sure.

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