Why can't I send messages on my iPhone 4?

For some reason, completely out of the blue, my phone stopped being able to send text and iMessages. I still have service and can receive messages, make and receive phone calls, and use the Internet, but every time I try to send a message the seshing bar fills up almost all the way, and then the message just disappears. Any way to be able to send messages would be amazing, thank you

Switch your phone to airplane mode then switch it back and the network will re-connect and if that doesn't work, restart the phone.

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