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by bigiain 4296 days ago
My gmail(and aws and dropbox and digital ocean and github and zoho and ...) TFA uses a TOTP app, not my phone number. (and works just fine on my iPad - which doesn't really have a phone number - at least not one I know or worry about...)

Also, according to the three biggest telcos where I live:

"SMS is not designed to be a secure communications channel and should not be used by banks for electronic funds transfer authentication," ( http://www.itnews.com.au/News/322194,telcos-declare-sms-unsa... )