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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...

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

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

You can port to Twilio, but, yeah.

Like you mentioned, you can use call forwarding — there's even things like conditional call forwarding if you just want to forward your missed calls or things that go to voicemail. I did exactly this to build https://tinyvoicemail.com (which I'll be open-sourcing in the near future)

The tricky thing is that your cell phone needs a number in order to receive calls.

Disclaimer: Twilio engineer

You could forward via VOIP! The biggest downside IMO is losing iMessage, or I probably would've ported mine years ago :)

Sorry can you explain? Do you mean installing a VoIP app on your phone?

Any other fun things I could build using my phone number on twilio???