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[ Ссылка ]
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Fixing IPhone error "message not sent"
One of the reasons for this error to occur is that the message center number of your carrier isn't set correctly!
to set that follow this
Change the SMS Centre Number
From the home screen, tap Phone.
1. If the dial pad is not visible, tap Keypad.
2. Enter *#5005*7672#, then tap Call.
3. The current SMSC setting is shown on the screen.
Tap Dismiss.
4. If the SMSC number needs changing, enter
**5005*7672*SMSCNUMBER#, (where SMSCNUMBER is replaced with the correct SMSC number in full international format).
5. Tap Call.
The message "Setting succeeded, Service Centre Address, No Address" will appear on screen.
6. Tap Dismiss.
7. Enter *#5005*7672# then tap Call.
The new SMSC number will be shown on the screen.
So follow the video to set it right to solve the problem
sources:[ Ссылка ]
