... correction: since you can call from overseas, then that # should be 24/7/365.Ok, I received a very quick response! And it 'seems' OK to me. They don't say whether the number to call when away will be available 24/7 considering difference in time zones etc. I imagine it would have to be, but I have asked!
"The two-step verification code will be requested in the situation that you are using a device that you do not usually use, or are accessing the BMO InvestorLine website from a different IP address than you usually do. When you enter the twostep verification code you will have the option to have the system recognize your device. Doing so should greatly reduce how frequently you are prompted for a code. A code will also be requested if your browser's settings are in private or incognito mode. You may wish to check your browser settings and make the appropriate changes to see if it resolves the issue.
If you only have a landline you may receive the code by selecting the voice message option. If you do not have access to a phone and you are unable to receive a text or voice message with the validation code, there is an option available when you call in that indicates this in the two step verification process. You will then be directed to speak with a BMO InvestorLine representative by calling the phone number below (from overseas, call 1-416-281-5400), and a representative will provide you with a verification code which you may enter online."
Obviously, the 2-step verification requirement is only initiated when you're banking from a different device suddenly (not applicable to moi) or have cleared out your computer cache/cookies (applicable to moi).