Verify an SMS Marketing List in two minutes
SMS is priced per message and unforgiving of bad data — texts to landlines simply fail, and disconnected or VoIP numbers waste spend and can flag your sender. Validating the list before a campaign means every credit goes to a real, textable mobile.
What's hiding in your list
Landlines can't receive texts at all, so any mixed list wastes a share of every send before it starts.
Disconnected and reassigned mobiles look valid by format but bounce silently, burning credits with nothing to show.
VoIP numbers are over-represented among fraudulent and throwaway signups and are riskier to text.
Email and phone — cleaned in one pass
Verify in one pass
Every email checked for deliverability and every phone validated — in a single upload.
Catch what others miss
Typos, catch-all domains, disposable addresses, dead numbers and silent duplicates.
Flat, simple pricing
Send SMS only to live, textable mobiles. No per-credit math, no surprise overage bills.
Clean leads in three steps
No setup, no integrations, no learning curve. Upload a file, download a better one.
Upload your CSV
Drag in any contact list. We auto-detect email, phone, name and company columns.
We verify everything
Every email checked for deliverability, every phone validated, duplicates flagged — with a live quality score.
Download clean leads
Export a verified, deduplicated list your team can actually call and email.
Email and phone, cleaned in a single upload — see exactly how many bad contacts are hiding in your list before you pay a cent.
100 free verifications · no credit card · results in under 2 minutes
Frequently asked
How do I verify a list before an SMS campaign?
Upload the numbers to BounceBlock — it returns line type, carrier and status so you keep only the live, textable mobiles.
Why filter by line type?
Texting a landline fails outright and texting VoIP is risky; filtering to mobiles is the single biggest cut in wasted SMS spend.
Can I validate international numbers?
Yes — BounceBlock validates numbers across 30+ countries, normalising them to a consistent format first.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.