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

There’s a slightly obscure method of being able to send text messages via email, sorta. If you know a person’s carrier and phone number you can email them a SMS text. This can avoid fees and issues with sending texts from online sources which generally has a cost per text. Its a janky work around, but it works

In even older days, places may buy bulk texting plans from carriers to on-carrier numbers, so knowing your carrier they could make sure to send it via the right plan for them so that its cheapest. There was a time where if you sent texts on the same carrier, costs were basically zero, but if it was to another carrier, it may cost a tiny amount

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