When you’re sending hundreds of thousands of messages per month, every undelivered SMS is wasted spend. For one B2B company running large-scale marketing and transactional messaging, that cost was getting out of hand.
After integrating CheckThatPhone’s real-time phone validation API, they cut SMS waste, increased delivery rates, and saved over 35% on messaging costs — without changing their campaigns.
Here’s how it worked.
🏢 The Company
A national B2C financial services platform running SMS-based lead nurturing, transactional reminders, and customer engagement campaigns.
- Sending 3M+ SMS messages per month
- Using multiple vendors and regional shortcodes
- Struggling with delivery issues, undelivered messages, and billing disputes
- No phone validation prior to send — all numbers collected via web forms or 3rd-party partners
🚨 The Problem
Their SMS platform was reporting a 15–18% delivery failure rate. Many messages were being sent to:
- Disconnected numbers
- Recycled or ported lines
- Landlines or VoIP numbers unable to receive SMS
- Numbers flagged by carriers as high risk
They were also paying per attempt — whether the message landed or not.
🛠️ The Solution
The company implemented the CheckThatPhone API as a pre-send filter, validating every phone number in real time just before message delivery.
Each record was tagged with:
- Line type (mobile, landline, VoIP)
- Carrier name and status
- Portability status
- Deactivation or suspension indicator
- Deliverability score and action recommendation
Messages were only sent if the API returned action = send.
💰 The Results
After 60 days in production, the impact was clear:
- SMS delivery success rate increased by 12.6%
- Message volume decreased by ~900,000 per month (filtered out unreachable contacts)
- Total messaging cost dropped by 35% across vendors
- No impact on conversion or engagement rates — in fact, those improved due to cleaner targeting
They also uncovered:
- High volumes of VoIP numbers from certain lead sources
- Suspended numbers in their own CRM database
- Inaccurate area code targeting in past campaigns
✅ Final Thoughts
When businesses validate phone numbers before sending, they protect their budget, improve performance, and reduce noise in their metrics.
With CheckThatPhone, you can:
- Filter invalid or unreachable numbers
- Reduce delivery failure costs
- Improve targeting and ROI
👉 Start your free trial and stop wasting money on messages that never land.