Late iPhone 5s group messages?

So, my husband has regular group messages on his iPhone 5s, but sometimes he doesn't receive the messages on time and then 6 hours later he will get 50 messages all at once. But the other people in the group receive there's, I have no problems receiving messages during the same time frame so I'm not thinking it's a service issue on our side. Is there a way to troubleshoot?

Sounds like an issue with your carrier. I would call them.

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