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When a message fails to deliver, it’s not just a technical hiccup — it’s a missed customer moment.
For software platforms running A2P 10DLC messaging, deliverability issues can quickly add up to frustrated users, lost conversions, and even damaged trust in your product.
The tricky part? Even properly registered and compliant Campaigns can experience failures. And because A2P messaging involves multiple ecosystem layers—your API provider, The Campaign Registry (TCR), Direct Connect Aggregators (DCAs), and carriers—pinpointing where things go wrong isn’t always straightforward.
Let’s break down how to diagnose what’s really causing 10DLC deliverability problems, and how Telgorithm helps fix them before they start costing you customers.
You may not notice deliverability issues right away—they often show up subtly before snowballing. Look out for:
Providers like Twilio, Telnyx and Bandwidth have “expected failure” codes—
For high-volume senders, these failures can quickly translate into real losses.
At Telgorithm, we’ve analyzed messaging volumes across our customer base and found that without Smart Queueing, between 5–13% of all SMS and MMS traffic would have exceeded T-Mobile’s limits and failed each month.
That’s thousands of undelivered messages—and thousands of dollars in avoidable carrier fees and lost marketing ROI. If your platform sends 1 million messages per month, that could mean $8,000–$10,000 in wasted costs annually simply from hitting daily caps.
It’s easy to assume “the carrier blocked it,” but most deliverability problems trace back to how your provider handles throughput, queuing, and compliance.
Here are the main culprits:
All major carriers and their subsidiaries manage rate limits differently. T-Mobile enforces a strict daily limit per Brand, affecting all affiliated Campaigns. Once the limit is reached, any additional messages sent for that day will fail (but the sender will still be charged).
Some providers don’t pause or queue messages when limits are hit—they just continue sending. Those extra messages fail instantly, wasting money and true delivery potential.
If your Brand or Campaign data in TCR doesn’t align with actual messaging behavior (e.g., unverified opt-ins, mismatched sample messages or “drift content”), carriers may quietly throttle or block your traffic.
A single-DCA setup means if that aggregator experiences congestion, outage, or slowdowns, all your traffic is affected.
If your provider only returns generic error codes or lacks real-time reporting, it’s nearly impossible to know what’s being dropped, where, or why.
If your customers are complaining about undelivered texts, here’s where to start:
Step 1: Check error codes and timestamps. Carrier-specific errors (“Message blocked by T-Mobile/AT&T/Verizon”) imply you need more throughput management and support from your provider.
Step 2: Review throughput configuration. Ensure your sending rate aligns with carrier caps and that your provider dynamically adjusts throughput by Campaign and Brand.
Step 3: Check the TCR registration details. Make sure your Campaign’s declared use case, sample messages, and opt-in method still match your live traffic. Misalignment is a common cause of filtering.
Step 4: Compare by carrier. If only one carrier (like T-Mobile) shows abnormally low delivery, the issue likely ties to throughput or caps—not message content.
Step 5: Monitor message lag. Delays often point to overloaded queues or inefficient retry logic on your provider’s side.
Deliverability isn’t just a number—it’s a reflection of how intelligently your provider manages your traffic. Telgorithm was built specifically for A2P 10DLC, meaning our platform actively prevents these issues before they happen.
Here’s how:
We’re connected to multiple DCAs for built-in redundancy. If one aggregator experiences congestion or downtime, your traffic continues flowing through another — maintaining consistent deliverability and uptime.
When your Brands or Campaigns reach a carrier limit, Telgorithm’s Smart Queueing automatically holds messages and releases them at the next available time—instead of letting them fail.
With Smart Queueing, Telgorithm customers prevent an average of 8% SMS and 13% MMS failures every month—saving thousands of dollars per month in wasted message costs and preserving critical customer communications that would have otherwise been lost.
Our system reports every delivery status change (ringing, sent, delivered, failed, etc.) instantly to your environment. That visibility empowers your team to react quickly, rather than waiting for customers to report issues.
Telgorithm’s team works directly with your engineers and compliance managers to ensure every Brand and Campaign setup meets carrier standards. We review initial Campaigns, flag risks, and provide hands-on guidance through Slack for faster resolutions.
Most ISVs only realize they have a deliverability problem after it starts costing them users. But reliable message delivery isn’t just a technical metric—it’s a customer experience differentiator.
When your platform’s messaging works seamlessly, your users trust your product more. Their customers respond faster. Conversions increase. And your team can focus on growth—not chasing down failed messages or fighting with carrier filters.
With Telgorithm, you don’t just send messages—you deliver results.
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