CheckNumber.AI 
Phone Number Validation
phoneCheck $4 per 10,000 checks
- Core data available
- number, activated
- Best for
- Format and reachability pre-checks before other tasks
No-code CSV REST API Exportable results
Validate & Score Phone Numbers
Go beyond "is this number real" — clean dead numbers and surface the ones most likely to respond.
CheckNumber's number checker validates and scores raw phone numbers before you spend on them, without sending a message or storing the number. Upload a CSV or call the REST API, and every row comes back with format and line-type validation, an activity level, and a high-value user signal, ready to clean, segment, or route into your CRM.
E.164
Phone input
From $4
Per 10,000 checks
3
Task types
Submitted number +1310••••4471
Result valid, active, high-value
Phone Number Validation Number Active Checker High-value Users Checker No account, number, or SIM required
Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.
What CheckNumber detects for Number Checker
Format and validity
Validates whether each phone number is correctly formatted and a valid, reachable number, so malformed rows are caught before you use the list.
Country and region
Identifies the country the number belongs to, so you can route, segment, or filter lists by geography.
Line type
Detects the line type such as mobile, landline, or VoIP, useful for choosing the right outreach channel.
Activity level
Returns an activity level of active, inactive, or unknown, derived from device, carrier, and internet behaviour signals, so you can prioritise reachable numbers.
High-value user signal
Flags numbers that show high-value user characteristics, helping you prioritise the most promising leads.
What You Can Check
Choose a Number Checker task by signal depth
All three tasks accept E.164 phone numbers. Select validity, real activity, or a high-value-user signal depending on what your workflow needs.
Number Active Checker
active_check $6.5 per 10,000 checks
- Core data available
- number, activated
- Best for
- Real activity filtering, distinct from platform registration
High-value Users Checker
high_value_users $7 per 10,000 checks
- Core data available
- Mobile Number, Result
- Best for
- Prioritizing outreach toward higher-value numbers
| Number Checker product | Task type | Input | Core data available | Best for | Current price |
|---|---|---|---|---|---|
| Phone Number Validation API documentation | phoneCheck | Phone numbers in E.164 format | number, activated | Format and reachability pre-checks before other tasks | $4 per 10,000 checks |
| Number Active Checker API documentation | active_check | Phone numbers in E.164 format | number, activated | Real activity filtering, distinct from platform registration | $6.5 per 10,000 checks |
| High-value Users Checker API documentation | high_value_users | Phone numbers in E.164 format | Mobile Number, Result | Prioritizing outreach toward higher-value numbers | $7 per 10,000 checks |
Core Number Checker data
What each Number Checker task returns
These core data categories follow the configured product outputs. Exact response keys remain in the API documentation.
Validation
phoneCheck - Number
- The phone number supplied for the check, in E.164 format.
- phoneCheck
- The validation outcome or detail, per the exported column headers.
Real activity
active_check - Number
- The phone number supplied for the check, in E.164 format.
- ActiveStatus
- The activity level of the number: active, inactive, or unknown — based on big-data and carrier signals, distinct from platform registration.
High-value signal
high_value_users - Number
- The phone number supplied for the check, in E.164 format.
- Result
- The high-value-user detection result (yes or no, per the exported labels).
The active_check task reports real activity based on big-data and carrier signals — a different concept from whether a number is registered on any specific app.
Run a Number Checker batch in three steps
Use the no-code platform for uploaded lists or the REST API for recurring workflows.
- 1
Prepare E.164 numbers
Provide one international phone number per row with country code.
- 2
Choose the matching task
Select phoneCheck, active_check, or high_value_users based on the signal your workflow needs.
- 3
Export mapped rows
Download the completed file and match each result to its source number.
Common Use Case
Improve Number Checker list quality before outreach
Cut wasted SMS/call spend by filtering your list down to valid, active, high-value numbers first.
No-code CSV REST API Exportable results
Signal 1
Validate and clean — catch malformed, invalid, or wrong-country numbers before they waste spend.
Signal 2
Activity level — see whether each number is active, inactive, or unknown using device, carrier, and behaviour signals.
Signal 3
High-value signal — flag numbers with high-value user characteristics to prioritise your best leads.
Number Checker FAQ
What does the number checker validate?
It checks each number's format and validity, identifies the country and line type such as mobile, landline, or VoIP, and can add an activity level and a high-value user signal, depending on the task type you choose.
How is the activity level determined?
The active-check task combines big-data analytics across device, carrier, and internet behaviour signals to label each number as active, inactive, or unknown, without contacting the number.
Can I run number validation in bulk?
Yes. Upload a CSV of up to hundreds of thousands of numbers or call the REST API, choose the task type you need, then download a result file per number. You are billed only for successful checks.
Is there a free trial?
Yes. New accounts receive 1,000 free checks on signup with no credit card, and every check is pay-as-you-go with no monthly fee, and the credits you top up never expire.
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