Don't waste SMS budget on landlines
Filter landlines before campaigns and avoid paying for messages that cannot be delivered. Clean lists can reduce wasted SMS spend by up to 30%.
Line type detection · Bulk CSV · Fraud controls
Carrier Type Checker — Filter Mobile, Landline & VoIP in Bulk
Separate mobile, landline, VoIP, toll-free, and premium numbers before SMS campaigns, outbound calls, or fraud review.
bulkchecker.io tags every number with a clear line type so marketing, compliance, and risk teams can route each contact correctly.
Mobile
Ready for SMS and mobile-first campaigns.
Landline
Suppress from SMS and route to call workflows.
VoIP
Flag for fraud rules and verification review.
Single-number trial
Preview line type classification before bulk upload.
Line type
Mobile
SMS action
Allow SMS
Risk hint
Low
Status
Live lookup required
Bulk-ready segmentation
mobile.csv
landline.csv
voip-review.csv
Business impact
Why Line Type Detection Matters
Phone type is a routing decision. A landline, mobile number, and VoIP number should not always enter the same workflow.
Detect VoIP for fraud prevention
VoIP numbers can be legitimate, but they often deserve different risk rules in signup, recovery, and account abuse checks.
TCPA compliance for outbound calls
Use line type as one signal in consent-aware outbound workflows, suppression logic, and audit-ready campaign processes.
Workflow
How It Works
Upload a list, tag every number by line type, and export segmented results for the next workflow.
Upload CSV
Upload campaign, CRM, event, or lead list data with a phone number column.
Each number tagged: Mobile / Landline / VoIP / Toll-free
Classify each record so routing, suppression, and review rules are easy to apply.
Download segmented results
Export mobile, landline, VoIP, toll-free, and unknown segments as campaign-ready files.
Definitions
Line Types Explained
Line type detection helps teams understand what a phone number can receive and how much trust to place in it.
Mobile (cellular, can receive SMS)
Best fit for SMS, WhatsApp, mobile verification, and mobile-first lifecycle campaigns.
Landline (cannot receive SMS)
Better suited to voice workflows and usually excluded from SMS campaign sends.
VoIP (internet-based, often higher fraud risk)
Useful for legitimate users, but often routed to extra review in fraud-sensitive products.
Virtual / Toll-free / Premium
Special number types that may need suppression, billing controls, or separate compliance rules.
Workflows
Use Cases
Use line type when sendability, compliance, or account risk depends on the kind of phone number submitted.
SMS Marketing (filter out landlines)
Keep SMS campaigns focused on mobile numbers and export landlines for separate handling.
Compliance (TCPA, GDPR)
Support consent-aware outbound rules and keep cleaner evidence for campaign decisions.
Fraud Prevention (block VoIP if needed)
Apply extra friction or review to VoIP and virtual numbers when abuse risk is higher.
Multi-country campaigns
Normalize line type rules across countries before routing local SMS, voice, and compliance workflows.
Simple pricing
Pricing ($4 / 10K)
Start with line type classification for 10K numbers, then scale into bulk validation and API workflows as list volume grows.
Starter
$4
10K lookups
Bulk
Custom
High-volume tiers
For developers
API Available
Add carrier type detection to signup forms, SMS routing, fraud scoring, and CRM enrichment workflows.
Alternative
Compare with Twilio Line Type Intelligence
Twilio is a strong option for teams already using Twilio services. bulkchecker.io focuses on line type filtering, CSV segmentation, and high-volume campaign workflows.
Read Twilio alternative| Feature | bulkchecker.io | Twilio |
|---|---|---|
| Line type output | Mobile, landline, VoIP, toll-free, premium | Available through Lookup products |
| Bulk CSV | Native segmented exports | Requires custom batching |
| Best fit | Marketing, compliance, and fraud teams | Existing Twilio platform users |
FAQ
Carrier Type Checker FAQ
Short answers about VoIP detection, supported countries, exports, and how carrier type differs from carrier lookup.
How do you detect VoIP?
VoIP detection uses carrier and line type intelligence to identify internet-based numbers and virtual phone services when the data is available.
What countries are supported?
International coverage is supported, with line type depth depending on local carrier data, numbering rules, and network availability.
Should I block all VoIP numbers?
Not always. VoIP can be legitimate. Many teams add review, step-up verification, or lower trust scores instead of blocking every VoIP number.
How is this different from carrier lookup?
Carrier lookup identifies the network and routing context. Carrier type checking focuses on the number category, such as mobile, landline, VoIP, toll-free, virtual, or premium.
Can I export results?
Yes. Bulk jobs can be exported as segmented CSV or JSON results for campaigns, CRMs, data warehouses, and fraud systems.
Is this a phone line type checker and line type checker for bulk lists?
Yes. The phone line type checker (also called a line type checker) classifies every number as mobile, landline, VoIP, toll-free, or premium. Upload a CSV and segment the entire list in one job.
Does it work as a landline or mobile checker and a landline checker?
Yes. Use it as a landline or mobile checker — also called a mobile or landline checker — to filter out landlines before SMS campaigns. The landline checker removes wireline numbers so your campaigns only target SMS-capable phones.
Does it also work as a VoIP detector?
Yes. The same engine acts as a VoIP detector — it identifies VoIP-origin numbers (Twilio, Bandwidth, Google Voice, etc.) so fraud and risk teams can flag higher-risk records during signup or checkout.