Verify Phone Numbers in two minutes
Phone verification is a different discipline from email validation — you are not just checking format but confirming whether a line is active, mobile or landline, and reachable in a given country. Dialing bad numbers wastes SDR time and can trigger carrier-level spam flags that affect your entire calling pool. Knowing line type before you dial lets you route SMS campaigns away from landlines and voice campaigns away from VoIP numbers that go unanswered.
What's hiding in your list
Number portability means a number with the right country code and prefix can still belong to a completely different carrier or line type than its format suggests.
Disconnected numbers often pass basic regex and even some HLR lookups if the carrier hasn't released the record yet.
International lists compound the problem because dialing code conventions vary — a number formatted correctly for one country may be ambiguous or invalid for another.
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
Validate line type and active status before you call. 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
What is the difference between format validation and live phone verification?
Format validation checks whether a number conforms to E.164 structure for its country; live verification goes further and queries carrier networks to confirm the line is currently active and returns the line type.
Can I verify phone numbers in bulk alongside an email list?
BounceBlock processes phone and email together in a single upload, so you get both verified in one pass rather than running two separate tools and reconciling results.
Why does line type matter for my outreach strategy?
SMS messages sent to landlines are silently dropped, and voice calls to VoIP numbers frequently go unanswered or hit voicemail systems that don't forward — knowing line type up front lets you match the channel to the contact.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.