Iphone problems with sending messages?

When i send messages from my iphone it says delivered but my friend says he don't get the messages i send. It also happens to me… How do i fix this? (I have a iphone 5c)

If it happens with everyone else you text then you should probably reset or if it doesn't work you should format your phone, maybe there's some application or something regarding the iphone updates that corrupted your phone's system…

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