iMessage sent but not delivered?

So i sent some iMessages to someone, they have sent but they don't say delivered at the bottom. They've been sitting like that for about a whole day now. Their phone is on, they are connected to wifi and they haven't blocked me

iPhone 6s, iOS 9.3.1

Posted on Apr 17, 2016 1:05 PM

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iMessage sent but not delivered?

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