> Imagine you're on vacation and have lost your phone.
A few years ago when SMS tokens and Authenticator apps where less common, I was able to do work without having my phone on the same room as my computer. Now I need to have it on my desk most of the time for logging in.
There are authenticator apps that will run on your computer, and apps that will let you read SMSs on your phone from you computer. You phone might need to be on for the latter, and maybe even connected to the same local network, but it does not have to be literally on your desk.
A few years ago when SMS tokens and Authenticator apps where less common, I was able to do work without having my phone on the same room as my computer. Now I need to have it on my desk most of the time for logging in.