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depending on the context, and your userbase, it's usually not too much extra work for them to choose one of 7 carriers and saves you a database lookup & maintenance.

if you insist on keeping the huge database (around 30MB), i actually wrote a miner script a couple years ago to scrape the NPA-NXX data as a CSV from 2 different sources [1]. (you'll have to change the $src key and run it twice)

[1] https://github.com/leeoniya/npa-nxx-miner.php

not sure I understand this. You can lookup which carrier a user uses based on area code and next three digits? what if user ports their number from one carrier to another?

good point.

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