IPhone 4 says it sent a text message, but it turns out it never sent the message?

So sometimes when I'm texting someone, my phone isn't sending the messages. It's not like it telld me mesage not sent, it says it sent it, then no one ever responds. And about 5 hours later when someone questions me on it, it turns out they never got the message? i feel like no one else is having this problem and it gets very annoying because i never know if my phone is sending a message or not because it tells me it does. Can anyone help me with this issue? Thanks.

This is a problem either with your carrier or theirs (or the interconnect between the 2). If the iPhone can't successfully send the message, you will be notified. Once it gets from the phone to the cell tower, it's in the carrier's hands.
Call your carrier and/or have them call  theirs.

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