Having a problem with messages on your iPhone can be easily fixed. Check several important things such as the recipient’s info, and the current status of iMessage on the Apple official site. If everything is fine, try to send the message you wanted a few more times. If that does not work, move to the 5 ways to fix can’t send or receive messages on iPhone 5c, and try them out. We are sure you will fix the bug.
See also: 5 Ways To Fix IPhone 5c No Service Issue
5 ways to fix can’t send or receive messages on iPhone 5c

Source: gottabemobile.com
Solution No.1: Settings
There are a few methods you can use to send the messages such as iMessage, send as SMS, and there is also MMS messaging. It is vital to have all the set to on. In order to check, go to Settings, and tap on Messages.
Solution No.2: Delete messages
If you have too many saved messages you exchanged with someone, you should delete them. If you want to keep something, take a screenshot. Once you delete the conversation, try sending the message again.
Solution No.3: iMessages on/off
This can help: go to Settings > Messages and turn iMessage on/off. After a couple of seconds, just turn it on again, and see if it will make a difference.
Solution No.4: iMessage sign out and sign in again
Click on Settings > Messages > Send & Receive. You will see the Apple ID, click on it, in order to sign out, and then, sign back in.
Solution No.5: Update iOS and carrier settings
To update the carrier settings, go to Settings, General and choose About.
To update iOS, first, connect your iPhone to a power source, connect to a Wi-Fi network, and then tap on Settings > General > Software update.
In case 5 ways to fix can’t send or receive messages on iPhone 5c listed above didn’t help, contact your carrier first, and go to the Apple Store if needed.