We have logic in our system for when we see that a particular number has sent more than one message that was carrier filtered in one day, we then swap that number out for a new one.
The system performs this way to prioritize message deliverability above all else. When text message gets filtered by the carrier, the likelihood that this phone number is filtered again increases. If a student texts a number that we have marked for swapping out, they will then receive the response on a new number associated with the advisor or department.
Carrier-filtered numbers are released programmatically 30 days after they have been swapped out. During that 30-day period, we will still route any inbound messages to their intended destination.
We recognize that messages coming from multiple numbers can be a little confusing, but with carrier filtering, it's possible that messages will not go out at all if we stick to one number. We take this approach to ensure as many messages can go out as possible.