This is an absolute horrible idea when it comes to both privacy and security.

First, there are TOTP applications for pc (Windows, Mac, and Linux), so you don't need a smartphone. I can recommend both BitWarden and KeePass (both are open source)

Second, Sim jacking is a very serious and widespread issue.
https://news.trendmicro.com/2022/02/23/what-is-a-sim-swap-scam-how-to-stay-protected/

Third, sms is unencrypted communication so anyone who wants can "listen" in: https://www.howtogeek.com/709373/why-sms-text-messages-arent-private-or-secure/

Give me A Verification code via IPhone Text Message before I blast you all over the internet and single handedly ruin your reputation!!

I can’t always provide a alternative email so why can’t you be like any other app and just send me a verification code via IPhone text message?

I am unclear why we must use an app for 2 step Authentication and do not have the option to use our phone number.

Why can't 2 step authentication be done by text message?

Hello:
Yes, please! Please offer two-step authentication via text message to a cell phone. I am trying very hard to get rid of spying Google and Android, will accept no more apps, and am about to get rid of my smartphone entirely, in favor of a simple flip-phone.
Please develop a system for two-factor codes to be sent to a cell phone!
Thanks, Peter Scott Cameron

totally agree with option to have 2FA via SMS, if not for all due costs, at least for paid plans

Hello,
So far I love Proton Mail. I originally added 2FA, I had to disable it as I tend to wipe my phone or something of the sort and have a hard time re-accessing my account(s). One thing I really like about other services is using SMS as a 2FA method, that way you can always have access to it and not worry about losing access to 2FA and thus your ProtonMail account. Another method I have seen, such as with Google + Android devices; when logging in, if you have your account logged in on a mobile device, instead of using a password, it will allow you to verify your login via your device which makes logging in a lot quicker. Either would be nice, personally, I prefer SMS verification as it is a lot simpler to do.

Regards,
Ethan.

SMS Verification - In addition to using authenticators such as Google Authenticator or Authy, it would also be a great idea to support SMS authentication. This would be useful because in the case that a mobile device breaks for one reason or another and you can not use the authenticator that is on it, your SIM card can still be used to access SMS verification (given you have chosen to use it).

Would like to get a text message every time when I log in to enter a verification code. Helps with using protonmail in public networks.

Sounds good but SMS are NOT save 1. Can be captured in the air at WIFI or 2. Recorded via Service Provider. BUT if use whats to take the gamble, by all means give the choice.

OR just use an easy Slider or Easy Puzzle Captcha, CHOICE!

Für alle, die kein Smartphone besitzen

set up 2 step verification for jitter bug or phone like it. we don't use smart phones

SMS was recently shown to be intercepted with ease. Spoofing a phone # and receiving all standard content pushed to it can be done by a child. If you have a service that lets you change your password with a verification code alone, disable that feature.

We should have to use an app for all 2FA, or especially 1FA.

I wish ProtonMail would add the option to have Two-Factor Authentication done via Free SMS instead of needing to use phone storage by dowloading an app.

I'd like to request 2FA by SMS (text message), too, because I don*t like to use smartphones for 2FA due to the potentially security risk: they are always-on devices with a lack of powerful security software and only a few percent own a Blackberry. But nobody would try to hack an old Nokia phone, so please offer support for text messages like Autodesk does.

Two factor sms authentication, necessarily for security

I've had my 2FA cloned on a google account while I was using google authenticator and this was used to login in to my account. When will we get 2FA via text message.

two stages login + sms