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Drop in a CSV with any column headers, test a single number, or integrate via our API. No special formatting required.
About SubscriberVerify
Real-time phone verification built for SMS teams
We help marketers, platforms, and compliance teams verify US and Canada phone numbers before they send — checking carrier, line type, deliverability, ported numbers, and litigator risk in seconds.
Robert Lee
Mobile Solutions Architect
Built by SMS practitioners, for SMS practitioners
After more than a decade in the SMS platform industry, we kept seeing the same problem: 8–18% of text messages never reach their destination — yet carriers still charge for them. Some of our clients were spending hundreds of thousands of dollars a month on delivery fees alone.
We set out to preview phone numbers before they hit carriers. Third-party lookup tools existed, but their pricing made large-scale verification impractical. So we built our own — real-time, reliable, and cost-effective enough to run on every send.
Within four months of integrating verification into our SMS platform, one major client saved over $5,300 per month in delivery fees alone.
We launched SubscriberVerify.com to bring that same capability to the broader SMS marketing community. Today it is a self-service platform with industry-leading pricing, deactivated-number checks included at no extra cost, and features that go well beyond basic carrier lookup.
Why verification matters
The problem we solve every day
Bad numbers, deactivated lines, and litigator risk drain SMS budgets and create compliance exposure. SubscriberVerify catches them before you spend.
8–18%
of SMS messages fail to reach their destination through carriers
5–15%
typical monthly savings on sending costs after verification
Real-time
carrier lookups — not stale databases that miss recent porting or deactivations
What you get
Every lookup returns actionable data
Run real-time phone number verification to check mobile status, carrier, line type, ported numbers, landlines, VoIP, SMS deliverability, and litigator risk — so you stop wasting budget on numbers that will never convert.
- Deliverable vs. undeliverable status before you send
- Carrier name, carrier ID, and line type (mobile, landline, VoIP)
- Litigator screening to flag numbers you should not contact
- Ported-number detection with new carrier and port date
- Deactivated and suspended number checks included at no extra cost
- Time zone, geo location, and SMS-capable landline identification
Platform capabilities
What SubscriberVerify checks on every number
Structured carrier, deliverability, and compliance data you can act on immediately — via CSV upload or API.
Carrier Lookup
Identify mobile, landline, VoIP, and unreachable numbers before you spend on SMS delivery.
Identify Carriers
Get carrier IDs and names so you can route messages to the carriers you want to reach.
Ported Numbers
When a subscriber changes carriers, we return the new carrier name and the date it was ported.
SMS Enabled Landlines
About 7% of landlines can send or receive texts. We identify them so you can still engage those subscribers.
Identify Time Zone
Get the time zone and geo-location registered to each phone number for smarter send timing.
How it works
From upload to clean lists in minutes
Use our dashboard, CSV upload, or API — whichever fits your workflow. Credits never expire.
Verify in real time
Every lookup hits live carrier data — deliverability, line type, litigator flags, porting status, and deactivation signals included.
Act on the results
Download enriched CSV output or sync via API. Your dashboard tracks daily, 30/60/90-day, and lifetime lookup stats.
