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Funnily enough, I've had a similar situation to that in my line of work.

It wasn't twilio, but it turned out that when we submitted a SMS message of over 160 characters, the provider split it into 160 chunks and sent out as multiple SMS.

So far, so normal. But what happened when the first chunk sent successfully and the second chunk failed?

We got back a notification to say "MessageID: 4ACB-etc Result: OK" but the customer never got the message, and scanning the report on the provider's site showed the customer number, time and message as having failed.

But then the representative agreed it was a problem and set out to fix it rather than blaming our dependence on the ID!