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Well, thank you for sending me down a rabbit-hole. To save other people the effort, yep, t-mobile does block SMS messages based on keywords[0][1].

[0] https://www.reddit.com/r/tmobile/comments/h8cotr/tmobile_sil...

[1] https://www.reddit.com/r/tmobile/comments/i1fk1z/tmobile_are...

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I was surprised the first time that I visited the States as an adult - I picked up a SIM for the week I was there, and discovered that I couldn't visit Oglaf on mobile data.

It's quite fascinating, because I come from a country with an actual official government censor's office. But I've never been blocked from accessing a smutty joke comic here. Yet in the US a major mobile provider takes it upon themselves to do so!

I'm pretty sure the reason "verification code" is blocked is because people will buy a bunch of retail prepaid unlimited plan sim cards and use them to send A2P messages like verification codes instead of paying Twilio or someone like that. Carriers don't like this because they charge more for A2P SMS than P2P.

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