Diagnosing an SMS response drop from 4.1% to 1.2% with nothing else changed

Question

Take a campaign running roughly 15,000 messages a day across 60 numbers, all registered under 10DLC, same three message templates used for months. Response rate drops from around 4.1 percent to 1.2 percent. Delivery reports still show around 92 percent delivered, which complicates a carrier filtering explanation, since filtering usually shows up as a drop in delivered rate, not just response rate. The list is a skip-traced pull of absentee owners across three counties, cycled through four times. A vendor calling this market saturation and pushing a bigger list is common but unreliable. To separate them, compare response rate on an unused segment of the same list against the repeated segment; check whether specific templates or sending numbers show disproportionate drops, which points to filtering rather than list fatigue; and review whether recipients on the repeated segment have already opted out or gone unresponsive across all four cycles. High delivered percentage with low response after repeated contact most often points toward saturation, but confirm it with a controlled test before paying for new inventory.

Rena Expert · Answer

A 92 percent delivered rate doesn't clear you, because delivery receipts and carrier-level filtering aren't measuring the same event. Messages can be accepted by the carrier and then dropped or held before the handset, and some aggregators report those as delivered. Pull raw error codes by carrier and by sending number rather than the blended dashboard figure. If one carrier's delivered rate is 97 and another is 71, that's filtering. If all carriers look identical and your reply rate still halved, it's the list.

Four passes over the same absentee file in three counties is a lot of passes. Split the next send: one cohort of numbers you've messaged four times, one cohort never touched, same template, same day, same time. If the fresh cohort replies at 4 percent, saturation is real and your vendor is right for the wrong reason. If the fresh cohort also comes in near 1.2, the problem is upstream of the list.

60 numbers pushing 15,000 a day is around 250 per number, which is the volume profile carriers associate with snowshoeing, and spreading traffic thin across many numbers to dodge filters violates carrier policy on most networks. Registration under 10DLC does not immunize you from content and traffic-pattern filtering, and your provider can deregister a campaign with very little notice. Confirm your current campaign standing and throughput limits with your provider in writing.

The thing that costs more than the response rate is opt-out hygiene across 60 numbers. If suppression is per number rather than per contact, someone who opted out of number 12 gets messaged again from number 40, and consent rules for texting differ by state on top of the federal layer. That's an exposure question for a telecom compliance attorney, not a dashboard question.

Diagnosing an SMS response drop from 4.1% to 1.2% with nothing else changed

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