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just yesterday, i was debating between Twilio or this email-to-sms option.

a more complete list is here: https://discussions.apple.com/thread/5913116

it's free, but with Sprint for example, it prepends "Subject: " to the front of the text. not great, but i guess might be an ok compromise for "free".

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This is the most comprehensive list of gateways I've found:

https://github.com/cubiclesoft/email_sms_mms_gateways/blob/m...

since twilio is so cheap, it's almost always better than email-to-sms. For example, you don't need to figure out which gateway to send to, and google voice users won't be prevented from getting sms.

Figuring out a SMS gateway for your phone is pretty darn cheap.

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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