NumberCheck is a system that enables users to accurately validate the status of UK landline numbers via batch process or API.

Key Benefits

  • Maximise call connectivity
  • Increase campaign performance
  • Boost agent morale
  • Improve campaign planning
  • Detect dead numbers before dialling
  • Clean your database
  • Identify live numbers that do not permit incoming calls

NumberCheck is quick, secure and easy to use. Free trial available

NumberCheck works by passively testing telecom networks and exchange equipment to rapidly detect the status of UK telephone lines (starting 01xxx, 02xxx). Our batch processing system can test thousands of number per hour, without denying a dial tone to subscribers at any stage. NumberCheck is fully compliant with Ofcom rules and regulations and adheres to all relevant DMA guidelines.

We take data security very seriously. All data is transferred over a secure connection (https). Clients are free to choose the data retention period (7, 14, 21 or 28 days) or can delete data instantly. The maximum data retention period is 28 days. Any data processed via the API is not stored.

NumberCheck supports Excel (xls, xlsx) and comma separated (csv, txt) formats.

Credits start from just £15 + VAT per 1,000.

Prices reduce to £12 per 1,000 for credits orders above 10,000 and just £9 per 1,000 for credits orders of 50,000 or more.

Of course. We offer 100 FREE credits so you can evaluate NumberCheck and ensure it meets your needs.

Simply register for an account and the credits will automatically be added.

Should you require more information or support, please call 01304 383838 or email

We can offer agency/reseller and volume discounts. Please contact us to discuss your requirements.