I'm not all that fond of phone based two-factor authentication any way. Especially, because phones break, get lost or get stolen at the least opportune moments.
But, yeah, I'm probably lucky
You can do computer science just with paper and pen. That is entirely feasible and totally common in any computer science curriculum at any halfway decent university. Oh, you thought that computer science = programming. Well, yeah, no... it isn't and technically you can program without a computer too. You just can't run your programs.
"I don't believe in sweeping social change being manifested by one person, unless he has an atomic weapon." -- Howard Chaykin