Contact list hygiene is one of the most overlooked levers for improving deliverability and reducing costs in B2B SaaS. When phone numbers in your CRM go stale, your team wastes time and budget on failed outreach. B2B phone validation performed at the point of collection — and repeated on a regular schedule — keeps your contact data accurate and your messaging effective.
Why List Hygiene Matters
Poor data quality creates several problems: failed SMS and call attempts, inaccurate personalization, lower deliverability rates, increased customer churn, and regulatory compliance violations. A well-maintained contact list ensures your messages go to real, reachable, and relevant people.
Key Recommendations
1. Validate Phone Numbers on Entry
Check number format, line type, and deliverability when data is collected through signup forms, CRM imports, or lead capture tools. Real-time validation prevents bad data from entering systems initially. A service like CheckThatPhone can validate numbers instantly during form submission.
2. Run Periodic Revalidations
Phone numbers change through carrier recycling and network transfers. Quarterly revalidations catch disconnected numbers, identify unreachable landlines for SMS campaigns, and update routing logic for ported contacts.
3. Watch for VoIP and High-Risk Numbers
VoIP numbers often fail or get ignored. Use line type detection to suppress disposable numbers and focus on reachable mobile users. CheckThatPhone flags VoIP and high-risk numbers automatically in every API response.
4. Align Numbers with Geography
Match phone numbers to user locations using GeoIP data to send messages at optimal local times, detect suspicious activity through region mismatches, and organize territory-based campaigns.
5. Create a Clean List Workflow
Integrate validation into internal processes by scheduling API calls, syncing data across teams, automatically flagging problematic records, and logging validation status in CDPs.
Getting Started
Contact list hygiene is essential for B2B SaaS companies given high customer acquisition costs and lengthy sales cycles. Clean data means better deliverability, lower costs, and stronger engagement across every channel. B2B phone validation does not have to be a manual process — automating it with the right tools makes a measurable difference.
Read the CheckThatPhone documentation to learn how to integrate real-time validation into your existing workflows, or view available pricing plans to find the right tier for your contact volume.