Android not giving me a "message not sent" notification.

This has happened several times in the last month. I live in a dead zone and occasionally have no service even to send a text. I used to get a ding and a "unsent message" notification on my home screen, but haven't 4 times in the last month. I only found the message when I went to send another text and saw the read notice on that message. Any tips on how to fix this? I have a dinosaur of a phone (Huawei Vitria) and SafeLink service (I cannot upgrade at the moment so a new phone is currently out of the question).

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