Re: Message send failure after sms
Were you able to send and receive before the jailbreak?
First try a hard reset.
Hold the top power/sleep button and the home button at the same time until the Apple logo appears, then release.
Next, try deleting all your old messages. They may be interfering.
Next, turn off text message forwarding. Go to Settings >Messages >Text message forwarding >turn off > hard reset> launch messages.
Next try Reset Network Settings.
Reset Network Settings
Settings>General>Reset>Tap Reset Network Settings. You may need to enter your wifi passcode back in afterwards.
If none of these work, you need to restore the phone as new. Not from a back up.