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"2. I have a phone number I share with companies / loyalty programs / etc."

How does this one work and who provides this number ?

I ask because a twilio number is not a mobile number and therefore cannot receive 2FA from "short codes".

I am sure you know what I am talking about and have run into this ... so I ask, if you have a number that you give out to "companies" (as I also do) do you have a mobile number that can accept SMS from shortcodes ?



I don't have any trouble receiving SMS messages from short code senders to either my Google Voice or my VoIP number. Is this problem specific to Twilio?

Sometimes sites want to know my mobile provider (why does it matter?), so I just choose Verizon or Other.

The only site that won't accept my GV number is att.com. Oh the irony...


I find sites that won't accept my Google Voice number on a semi-regular basis. I think the most recent was Uber, which I discovered when moving phones a few months back.


I wonder if I have more success because my GV number was originally a cellular number (many many years ago). I've used it with Uber and Lyft successfully.


Yeah, Uber blocked my GV number.


It’s alright they just locked me out of my account when they transitioned away from email. I use lyft now. Then they did the same thing. When did technology get so shitty?


What do you mean? You can filter by the number type in their api. They do offer mobile numbers.


No, they don't. There is a proper industry definition of what a "mobile" number is and only "mobile" numbers can accept SMS from shortcodes.

All of the 2FA from FANGs and banks and so on come from shortcodes so you can't do a lot of those 2FA workflows with a twilio number (or a number you port to twilio).

As per engineers at the Signal conference, there are no plans to make proper "mobile" numbers available at twilio.


Ahh, receiving short codes is a niche I've not yet encountered, that makes sense.




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