How to use two-step verification on cell phone

Note: Your question may already be answered in the Bitwarden Help Center. I have a yubikey I’ve been using with lastpass, on my desktop, but haven’t had it on my mobile devices. Is there any way with bitwarden that I can it on all my devices, or should I just use sms or some other way?

Yes, you can enable 2 step verification for your cell phone. U2f may not be supported and you may have to use yubikey OTP, but that is the same for LastPass, too.

Note that 2 step verification is only on login. You do not need it when you unlock.