[my_first_acct]

Note that Twilio numbers (in the US, anyway) cannot receive SMS messages from short codes [1]. This means that you may not be able to receive SMS 2FA messages from your bank.

[1] https://support.twilio.com/hc/en-us/articles/223181668-Can-T...

[etaioinshrdlu]

Is there any reason why twilio can't start supporting them?

[justinjlynn]

Probably for the same reason twilio don't allow you to set your CNAM entries. Banks and PayPal use it for KYC and such...