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

Forms like that often ask semi-relevant information for market research. Most people don’t even think about it and just write down their carrier, giving the business an extra bit of info. That info could in theory be sold (sounds dull, but people pay for all sorts of information).

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