I'm using an old Android phone (Moto X) as a "two-factor security dongle", i.e. I have the M$ Authenticator app installed on it for VPN and Exchange access from

I'm using an old Android phone (Moto X) as a "two-factor security dongle", i.e. I have the M$ Authenticator app installed on it for VPN and Exchange access from home office - unlike my "regular" mobile phone, which I may forget to take with me while I'm at home, it's on my desk the whole time...