Determining if a Phone Number Is a Wireless Phone Number
Written by Pat Parkhill
Updated at August 4th, 2025
LiveVox uses a database of wireless numbers from Interactive Marketing Solutions (http://www.ims-dm.com/). LiveVox has a subscription from IMS for the automated file delivery service for the following:
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The wireless block identifier file (the list of area codes and exchanges or blocks of numbers assigned to wireless carriers active within the North American Numbering Plan in the US and Canada).
- Received monthly from IMS.
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The ported number file (the list of numbers that appear to belong to wired landlines but are now assigned to wireless telephones and the list of numbers that appear to belong to wireless telephones but are now assigned to wired landlines).
- Received daily from IMS.
For more information, refer to the FAQ from Interactive Marketing Solutions:
While the IMS services are very accurate, LiveVox cannot guarantee 100 percent accuracy at all times, given update intervals and other factors.