So, you've registered your brand ✅
Submitted your campaign ✅
Bought a number ✅
Hit “Send” ✅

…but your messages still aren't going through 😵‍💫

Let’s break down the most common reasons behind A2P 10DLC SMS failures—especially on platforms like GoHighLevel—and show you how Signal House fixes them 👇

Before we dive into fixes, here’s how your message actually travels:

1. Signal House (when you click "Send" it travels through our network to our upstream providers)

2. Direct Connect Aggregator (DCA) (middleman between us & carriers)

3. Carrier (T-Mobile, AT&T, Verizon)

4. Recipient's Handset

At each step, there’s potential for something to go wrong.

Note: Signal House doesn't filter your messages; but the carriers will if your messages are indistinguishable from known spam content OR swear words/SHAFT content is present

Risky words include:

"Free", "Act now", "$

quot;, "Urgent", or anything under SHAFT (Sex, Hate, Alcohol, Firearms, Tobacco)

✅ Fix It:

• Avoid spammy phrases

• Use casual, helpful language

You registered a campaign for customer support, but now you're sending marketing offers.

Carriers call this drift and they hate it. It can get your campaign flagged or shut down 🚫

✅ Fix It:

• Choose a Mixed-Use Campaign so you can send different types of messages

• Keep content aligned with what you registered

You might be sending more messages than your campaign is allowed to handle:

• Low Volume Campaigns: 2,000/day on T-Mobile, 6,000 total

• Standard Campaigns: Up to 200,000/day (with vetting)

✅ Fix It:

• Upgrade to a Standard Campaign if you’re scaling

• Apply for vetting to increase your message volume

Sending to inactive or non-existent numbers? That damages your deliverability.

✅ Fix It:

• Use number validation tools before importing contacts

• Mix cold outreach into normal conversational messaging

If customers frequently opt out or report your messages as spam, carriers will penalize you.

✅ Fix It:

• Get consent! Having consent is the number 1 way to avoid high opt out rates

• Always include a clear opt-out option

• Send value-driven messages

Goal: Keep opt-out rates under 1%

✅ Choose the right campaign (Low Volume vs Standard)
✅ Avoid drift content — stay within your use case
✅ Review your content — be clear, valuable, and compliant
✅ Track your performance — monitor delivery, opt-outs, and failure rates

• No aggressive internal filtering

• Tri-redundant DCA routing for better delivery

• Lightning-fast provisioning & campaign approvals

💬 Still having issues?
Let our team diagnose it. Just reply to this email or reach out inside the Signal House GHL App.