A few years ago Marco Pivetta and I chatted about YubiKeys. He described his setup which was absolutely amazing to me at the time. The most intriguing point was, that he could get the 2-Factor Authentication tokens from whatever phone as long as he had the YubiKey with him.
Recently my phone broke and I had to setup the whole 2-factor authentication thingy again and again. That was the time I remembered that chat again. So I decided to test it out.