eli5: Why does the text alert system need to know my mobile carrier?

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Putting a book on hold from my library, and one of the options is to get a text message when it is ready for pickup.

The online form requires me to specify my mobile carrier.

Why is this necessary? It’s not like I need to know if someone is on Verizon or T-Mobile or whatever to send them a text… is this an artifact of a time when this WAS necessary? Or am I missing something?

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8 Answers

Anonymous 0 Comments

They may be using an email-to-mms gateway, in which case they need to know the email address associated with your phone number, which can be determined knowing the carrier.

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